These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Brotherhood as a whole, Are they Ineffectual villains who do try to be bad but are easily outmatched, or are they missunderstood misfits being targetted by the X-Men.
Lance: did he really have a heroic side, or was it just a trick to get Kitty to like him? Can it be both in the end, with Lance starting to do good things just to get Kitty into liking him and then keeping up just because he was in the mood? And if it's either the first or both, just how heroic can he be: sympathetic Anti-Villain, hard-ass Anti-Hero, prospect Nineties Anti-Hero, or something else whatsoever?
Scott: was he just trying to be a responsible leader who let his rivalry with Lance get the better of him sometimes, or was he unneedingly hostile to him? We also have his relationships with Jean and Rogue to consider...
Were the New Recruits complete idiots who crossed into Too Dumb to Live, or just inexperienced and excited at the prospect of being mutants that they got ahead of themselves a few times?
More specifically, Bobby/Iceman. Did he truly learn his lesson and become a good asset to the X-Men/New Mutants, or were his Too Dumb to Live credential just swept under the rug?
Was Spyke an asshole who was Easily Forgiven only for being a newbie and Storm's relative, or just an antihero as well as too young and constrained to do it right?
Was Rogue really a sympathetic and lost young girl and in dire need of help, or was she just a self centered whiner who only paid attention to her own problems?
Did Mystique really try to help her stepdaughter, or was it just her way of emotionally manipulating her to get more information easier? And what about her and her biological son Kurt...?
All of Magneto's actions with Wanda. Given how powerful Wanda is, her lack of control is indeed something to fear. Having Mastermind Mind Rape her, since he did try to resolve things the old fashioned way beforehand.
Sympathetic anti-hero trying to live her own life despite being raised as a weapon, or mentally ill mutant held back for the good of the general public? The answer depends on the fan, but her mood whiplash and the randomly placed flashbacks in her premiere episode may be evidence that she isn't stable enough to function outside the military. Even as a child, when they tried to socialize her, she would end up breaking things and having to be forcibly removed from the area. Perhaps HYDRA's holding her prisoner was a good thing.
Her instability could very likely be a result of HYDRA's treatment of her for her entire life (as a weapon, that is). Attempts to bring her outdoors were clearly more about making her blend in with society that genuinely trying to socialise her. To further this point, the doctor who gave Wolverine this information in X-23's first appearance seemed to lean towards this point and felt terrible about the way HYDRA treated her; and their attempts to recapture her in her second appearance. Add Wolverine's disgust with their treatment of her, and the episode largely implies that if she'd been raised as a normal child she would be more stable (her existence was about creating a weapon based on Weapon X, so ...)
Bizarro Episode: Said episode, Walk On The Wild Side, counts for some people - it comes off as an Anvilicious "feminism" episode where the writers just wanted to preach about men not gloating about how girls are lucky to get saved by them, coupled with some OOC behaviour (seriously, why would Kitty, Jean or Amara wear those black leather outfits?) Since it's filler, though, people who dislike it tend to simply ignore its presence.
Arguably, and to a much lesser extent, African Storm, since the episode is about a magic priest of some kind stealing Storm's soul, when magic has never even been mentioned before (save for Xavier talking about Juggernaut's powers being activated via mysticism, but a later episode retconned this by claiming the gems of Cyttorak are radioactive, rather than magical). Sadly, this is the only episode where Storm is the main focus.
Crazy Awesome: Everything the New Mutants do. They STOLE THE X-JET FOR A JOYRIDE! They BROKE INTO THE DANGER ROOM FOR UNSUPERVISED TRAINING! Hilarity Ensues!
Creator's Pet: Jean is accused of this by some fans. Being depicted as a beloved, popular girl who's good at both academics and sports, who's always liked by everyone, similar to her comic-self but without the development to warrant it. Though, she actually got the least amount of focus in the series, averting this.
Die for Our Ship: Avalanche was bashed by Nightcrawler x Shadowcat fans. Jean was bashed by Cyclops x Rogue fans. Surprisingly, Nightcrawler's canon girlfriend Amanda took much less heat than them...
...Thought still took a lot of heat herself. Like, did you know she was actually repulsed by Kurt's appearence and wanted him to hide it? Neither did we! Either that, or Amanda wanted to flaunt his appearance around too much. However, Piotr/Colossus, who was Kitty's comic book love interest and got some ship teasing at one point, doesn't ever get bashed in the show's fandom, probably because many forget he existed. Thought, Kitty/Piotr fans are just as likely to bash Lance as they are. Kurt himself isn't usually bashed by Lance/Kitty fans, as most just think of him and Kitty as close friends. Some do, however, still hate him, despite not actually being in the way of anything.
Draco in Leather Pants: It is very true that the Brotherhood is much more sympathetic than in other continuities, but some of their fans claim they're utter saints bullied by the evil X-Men, and conveniently "forget" that sometimes the boys reach dangerous levels of criminal negligence in their actions. Even some pages of this very Wiki tend to forget that, while yes, they weren't as active as most villains and weren't very competent, they were still criminals who did do a lot to deserve their treatment. Some people avoid this by, instead of down playing their bad points, they instead give them a few levels of Badassary to make them more of a match for the X-Men (Extremely common in 'Season Five' fanfictions).
Dude, Not Funny!: In the fourth season, when the Brotherhood play around with a petrified Mystique. Nightcrawler reacts in appropriate horror, given she's his mother.
Also, pulling Nightcrawler's tail, as Scott found out.
Among the main cast, the three who get with the largest followings seem to be Rogue, Nightcrawler, and Shadowcat. Rogue, given the fact she's arguably the protagonist of the series, doesn't qualify, but Kurt and Kitty are so beloved that they're pretty much shipped with everyone, and have little to no Hate Dom, something that Cyclops, Jean, Evan, and even Rogue can't claim.
The Brotherhood started out as stock villains for the X-Men to battle in the first season, but became incredibly popular. This likely led to their roles as Anti Villains and eventual Heel-Face Turn.
The New Recruits, though while also disliked, had quite the following too, primarily due to being a team of mostly Fun Personified characters.
Similarly, the Acolytes, primarily Gambit, Colossus, and to a lesser extent Pyro. Pyro because he's an Axe Crazy pyromaniac, Gambit due to a mix between Evil Is Sexy, his soft-spot for Rogue, being one of the most badass and charismatic characters, and his and Rogue's comic-book relationship and their respective popularity, and Colossus due to being (literal) Iron Woobie forced into villainy with room to redeam himslf, along with his comic book self's popularity and relationship with Kitty.
Epileptic Trees: While Ray started out as a Morlock in the comics, the writers never clarified just what his connection with them was in the cartoon, other than he had arguably heard of them, which is how he managed to lead the rest of the New Recruits to hide with them after the X-Men were exposed. And the implications of that connection has made his back story even more ambiguous, even compared to the other Recruits, given that most of them never discussed their backgrounds. Most of the fans tend to write him, in fan fiction, as the child of a broken home who ran away and wound up with the Morlocks before being found by Professor X. They also tend to explain that the Morlocks actually pretended not to know him, since he left them they saw it as an act of betrayal and have since shunned him.
People on The Other Wiki have made some guesses about Avalanche. Namely, they've guessed he's likely Greek, with 'Alvers' being an Americanized corruption of the name 'Alvez', and that his middle name is 'Domonic' to match his name in the comics.
Evil Is Cool: The Brotherhood, though this is more like "misbehaving yet not being super evil is cool".
Likely a large part of Gambit's appeal, though he's technically not evil, so much as he doesn't really give a fuck about anything besides himself and his pockets.
Fandom Heresy: Concerning Avalanche's morality, if you don't think him and Kitty were cute together, or you're critical of the way he was written to make their relationship work, you must be a childish, whiney Lancitty hater who's just mad that he 'stole' Kitty away from Kurt, Piotr, or whoever else. While Lance is very unfairly treated by some fans of Kitty/anyone else, the romantic plot with the two is hardly the best written or strongest aspect of the show, yet you can't so much as mention it was forced without people writing off anything you say as 'ranting'.
Fan Dumb: Quite a vicious case of it, by no means are they Avatar: The Last Airbender , but certainly quite bad. Mostly from the shipping side, namely, you can't express any interest in any ship without someone wishing death on you.
Fan-Preferred Couple: Rogue and Cyclops. There was a lot of Ship-to-Ship Combat in the series, but this was by far the less debated pairing compared to what actually became canon (Cyclops and Jean).
Nearly all fanfics featuring Toad have him paired with Nightcrawler rather than Wanda.
Nightcrawler/Shadowcat. It was mostly a side-effect of portingtheir relationship from the comics to the show. Kurt's canon crush on Kitty prior to dating Amanda and their consistantly close friendship after probably helped, along with them being the biggest Ship Launchers in the fandom.
Among yaoi fans, Lance/Pietro.
Foe Yay: The show seemed to set up a few of the X-Men and Brotherhood as having counterparts on the other side. Avalanche x Cyclops wrote itself with their rivalry. The same can be said with Toad x Nightcrawler and Spyke x Quicksilver.
Magneto x Xavier! Those to have so much Unresolved Sexual Tension between them it isn't funny. There was the suggestive looks, the fact that Magneto protects him at several points in the series and Xavier 's unfailing objections to putting an end to Eric. This can cross to Ho Yay when Magneto does a Heel-Face Turn (or in the origin when they were still on the same side)
Probably because the focus of the series was on the younger and more attractive cast. The show's younger fanbase probably didn't want to think about two old guys doing it while there are hot teenagers like Cyclops, Avalanche, Nightcrawler, Quicksilver, etc, to ship together.
Growing the Beard: The show has decent to average quality in season 1. Near the end of season 2 and the beginning of season 3, however, the show becomes more serious, while still retaining its playful humor, and focuses more on characterization and action. Seasons 1 and 2 focused more on introductions and romance respectively.
Ho Yay: Yaoi fans were particularly interested in what Avalanche and Quicksilver did with their free time together living in the Brotherhood Boarding House.
Nightcrawler and Cyclops. And Wolverine and Captain America in the season 2 episode about Operation Rebirth.
Re: Nightcrawler and Cyclops. In the "Evan with a camera" episode, Evan says, "Scott's pretty stiff, but Kurt usually takes care of that." Can't make this up.
The scene where, after the mansion is destroyed and characters have to share rooms, Scott and Kurt emerge from their bedroom with Scott being covered in Kurt's fur.
Hilarious in Hindsight: It's a bit ironic that Noel Fisher would voice Toad, a mutant resembling a frog-human hybrid, considering that one of his earlier roles was Troy McGinty, who was deathly afraid of a human-frog hybrid children's show character named MacGoogles.
Idiot Plot: Say what you want about most of the episode, but Joyride falls apart pretty quickly when you remember Wolverine's advanced senses and Xavier and Jean's telepathy, either of which should have identified who was the culprit instantly.
Jerkass Woobie: Mystique. She was a Manipulative Bitch throughout the entire series, but by the time she realizes the error of her ways in the finale, and begs forgiveness from her children Nightcrawler and Rogue, they've completely lost faith in her, and don't want anything to do with her.
Launcher of a Thousand Ships: Both Kitty and Kurt are beloved by shippers. It likely stems from their popularity, or their easiness to relate to, but Kitty's pretty much shipped with every guy in the series, and Kurt's shipped with everyone, everyone.Save for Rogue.
Risty asked Rogue to a Sadie Hawkins dance. That is literally what happened; Scott was taken, so Risty suggested that she and Rogue go. This, of course, makes the reveal that Risty was Mustique this whole time VERY awkward.
Magnificent Bastard: Magneto. The clincher was erasing his daughter's memory of her crappy childhood rather than accepting the damage his own actions caused, simply so she would stop ruining all his plans and trying to to kill him. In doing so, he ended up in a win-win situation for EVERYONE probably makes him one. Toad can now spend time with Wanda, Pietro no longer has to fear her, Wanda's childhood trauma is gone, and he's free to do whatever he wants without the single most powerful mutant known at the time trying to kill him. Though, some consider this a Moral Event Horizon too.
Pietro had his when he had a train derailed for the purpose of pretending to save people, and upon finding out that if they fail hundreds will die, including himself, he runs away and leaves those trapped, and potentially the entire town, to die. He knew his Brotherhood friends and his sister were there, and he left them there anyway!
Technically, he only sped into Lance's jeep in the driver's seat and waited for Toad and Blob to hop in (Wanda was not present). Still crosses the MEH, however due to the fact they only did it to end their heroics "the way they came in - with a bang"
Toad stole Kurt's image inducer — not that bad, until you remember that he purposely chose to do it while Kurt was meeting with his girlfriend Amanda's parents, ruining his chance at making them like him.
Magneto had it when he had his own daughter Wanda mindraped, just so she'd stay away from him. Said mindrape took place via replacing her memories of him abandoning her in a mental institution, which is what made her become a Dark Magical Girl in the first place, into loving memories that made her forget his abuse.
It's also heavily hinted that Magneto experimented on Kurt when he was a baby - Mystique's cry of "What have you done to him?!?" - implies this version of Kurt didn't start out with the blue fur et all.
Mystique when she tried to kill the New Recruits, for no reason other than them being unable to fight Magneto. And she did it again via kidnapping Scott, stealing his Power Limiter aka his ruby quartz glasses, and leaving him stranded in the middle of nowhere.
There was also the soft-drink manufacturer who unknowingly laced his drink with mutant poison. You can tell he's genuinely surprised... then Mood Whiplash kicks in and he figures he can make a lot of money off the discovery. It ended up not going anywhere, however.
Apocalypse was planning on using his machine to turn the populace into mutants... But even he notes that this may kill much of the human population, due to their bodies not being able to take it. He still was willing to go through it.
Needs More Love: The show is generally remembered well, save for some pockets of fans, but Marvel really didn't care about it and axed it rather than continue it, at least in part because the writers didn't want to follow their demands on including more Wolverine and other heroes.
Mesmero's introductory episode was this from the beginning to the end.
Apocalypse straddled the line, helped by the fact he wasn't particularly wordy in this continuity.
PossessionSympatheticRelationship Sue: Rogue is not a Mary Sue in canon, but fangirls latched onto her so strongly that they often made her look/act in their fanwork like anything but herself, as well as making her Scott's One True Love despite him not even realizing that she had a crush on him. Made even worse by their bashing of Jean, whom they demonized to an horrifying degree because Scott liked her more than the precious Rogue Sue they had in their minds.
Kitty is also often used in some stories as a step-in for the Author and reader's romantic fantasy, either with Kurt as a friend turned boyfriend who's in an unhappy relationship (Forgetting that Kurt and Amanda were seen as very loving), or Avalanche as a loving, perfect, flawless boyfriend (Forgetting that, as heroic as he could be at times, Avalanche had a lot of flaws), or as a Bastard Boyfriend and abusive monster and/or attempted rapist so she could be saved by Kurt (forgetting that, as flawed as he could be or as angry as he could get, Kitty was very much his Morality Pet). Or anyone, really. Fangirls might like one male character (or sometimes one female character) and they'll fair them up with Kitty. They often admit this though.
Real Women Never Wear Dresses: For some "fans", Kitty and Jean (though mostly Jean, despite her tomboyish leanings) were... too girly to be "likeable and relatable". Rogue, and later Wanda, were the yardstick to measure "womanly strength" in the series. And yet, there's still fans who call them out (along with X-23) for being 'too whiny'.
Jubilee is often regarded as the most useless X-Woman to the general public (comic audiences feel differently though), here however, she's an Ensemble Darkhorse.
Romantic Plot Tumor: Scott and Jean for some. They didn't get together unrealistically fast as would be required by the above trope, in fact it took them three seasons to. The problem is, some people got sick of waiting for them, or of them hogging the spotlight. However, this view is only supported by Scogue fans, Brotherhood fans, or just people who don't like them. Those who like them, or are just plain neutral to them, however, do NOT believe this.
Ron the Death Eater: Just ask the rabid Brotherhood fans what they think of Professor X. Just... do it. And see them foam at their mouths.
Also, Lance/Avalance. He does have his shade of jerkiness and specially at the beginning... but considering how some people talk about him, you'd swear he's a Bastard Boyfriend who'd rape and murder Kitty if he could.
EVERYONE gets this from some corner of the fandom. However, the biggest victim is Jean. The nice friendly psychic who was disgusted at the prospect of using her powers for unhonest deeds was utterly defiled in a lot of fanfictions.
Adding to that, this trope should be renamed 'Jean Grey Was A Bitch' thanks to how badly she gets this. Unlike Xavier, Lance and others, Jean had almost no shades of jerkiness, and was easily the friendliest character in the show. While she does act too perfect, in fact a lot of people who didn't like her cite her being too perfect as the reason: she did have her flaws like everyone else (clingy, passive-aggressive, self-centered sometimes, can't be true to herself and othersabout her crush on Scott, as well as having a bit of a temper), but she was a good person overall. Unlike Lance, however, this isn't motivated mostly by Die For Our Ship, though did happen in regards to entitled Scott/Rogue fans: many people hate her and Scott (who also gets this from some corners of the fandom, but not nearly as badly as Jean) just the same, but most of the fandom hate her for 'being a manipulative bitch and a whore', despite there being zero evidence to this. As much she flirted a little with Scott while with Duncan and showed jealousy when her best friend Taryn showed interest in Scott, but there's no real evidence about her cheating.
Scott was a bit of a workaholic and didn't have much in the ways of humour, and at times seemed a little hotheaded. The former two were played for laughs while the last was something he shared with a lot of characters, including his rival Lance (whose fans are usually the ones giving Scott this treatment). He didn't trust the Brotherhood and Lance in particular, and once told Kurt to stop goofing around. That is because the Brotherhood often antagonised him, and Kurt's goofing around consisted of him joking about revealing his secret, something that Scott would naturally have an issue with. But, completely ignoring his Big Brother Mentor like relationship with the others, his dedication to Xavier's cause, his various Crowning Moments of Awesome, and the fact that he always apologises for anything wrong he actually does, a lot of fans, especially Brotherhood fans but occasionally others as well if its shipping related, have gone as far as to declare him a hypocrite or have other characters talk about how much they hate him for being a Jerk Ass in fanfics. Some fans will also attack him for his actions in the comics (specifically how his marriages ending), but without actually reading those stories in the first place, and usually ignoring details that lead to those (like his and Maddy's marriage breaking down before he left and his eventual attempt to fix things and apologize, or the questionable consent on his part with his affair with Emma).
Rooting for the Empire: The original Brotherhood members just don't come off as evil to many fans, despite all the horrendous things they did including rigging a train accident to look like heroes one last time and then fleeing when they discover it's going right at another speeding train with eight tankers of fuel. Even with this, however, they are just the "Bad" in a The Good, the Bad, and the Evil situation, which lends a certain degree of sympathy to them, as does how they're constantly abandoned by the people who strung them along or generally treated horribly by everyone, including their supposed allies. They often ignore how, even without Mystique's or Magneto's guidance, they could still cause serious trouble.
The Scrappy: Spyke was an example of the crew's attempts to bring in a brand new X-Men character for the series who would be the "epitome of cool." This failed so badly (with almost all of the fans being irritated by his "cool lingo" and overall skater persona) that he was Put on a Bus halfway through season 3, having experienced further growth of his "spikes" to the point where he looked more like an armadillo than a kid, he ran away to live with the Morlocks in the underground sewer system. It didn't really help matters that he had basically the same powers as a relatively well-known Morlock from the comics, Marrow, although Word of God says this was a complete accident.
Yo Rogue, why don't you shed them gloves and give K-Girl a tiny tap?"
Strangled by the Red String: The Lance-Kitty Relationship. Your mileage will HEAVILY vary there. This is because the writers didn't seem to realize that while the two definitely had the potential to be a good pairing, mostly due to Lance's Character Development during the course of the series, it was made a little tough to believe due to Lance trying to kill Kitty and her parents in his first appearance and her forgiving him so quickly, and did so before his Character Development, which appeared to be motivated so he could get together with her, or that it started from him saving her from a mess he caused. Judging from the large number of supporters though, its probably an example of this working.
Strawman Has a Point: When Lance joined the X-Men, Scott does not trust him and eventually accuses him of being behind a series of joyrides which have totaled the various X-Vehicles. He is presented as being in the wrong for not trusting Lance and being so apprehensive, in order to motivate Lance to stick with the Brotherhood, even after Scott realizes he was being a dick about it and apologizes. However, Scott had every right to be suspicious as Lance had been an aggressive criminal and was only interested in joining because of his crush on Kitty. Scott even did try to welcome him at first, but became dissuaded when Lance repeatedly did things for the fun of angering Scott including lying about going on joyrides when he did not.
Magneto had schemes such as evolving the mutants he deemed to be 'worthy', and assembling a group of followers to his cause, in preparation for the inevitable war against humans when the world finds out they exist. Xavier always felt he was taking an extreme stance against humanity and opted to reveal themselves when they were ready... except there was one rogue SHIELD agent who deemed mutants a threat to humanity and built a Killer Robot with advanced weaponry to go after Wolverine and the larger X-Men and Brotherhood members, though Magneto arranged the battle was brought to the world's attention. The result is a widespread witch-hunt against mutants leaving them on the run. Xavier was conveniently out of commission thanks to Mystique, but one wonders what his reaction would be to see police around his school.
Tear Jerker: In "Shadowed Past", Xavier visits Mystique to talk about recent events involving her son Kurt and asks her, "Was It Really Worth It?" The episode ends with Mystique watching a mother drop her daughter off at school, with the two hugging.
In the episode which introduced X-23, her back story was practically nothing but this. Not to mention watching her break down during her conversation with Wolverine.
They Wasted a Perfectly Good Plot: At the end of an episode where they find out that contact with a new sports drink can harm mutants, the creator of the drink promises Professor X to stop selling the drinks. But when Prof. X leaves, the creator gets out his phone and calls someone to tell them about it, with obvious malicious intent toward mutants. But it never goes anywhere and we never hear about it again. This, along with a few lose plot threads found in the fourth season, could probably be attributed to Marvel deciding to axe the series.
Half the canon pairings were only hinted at, but they never did anything with the potential story-lines. Iceman and Jubilee, Magma and Cannonball, Wolfsbane and Sunspot...
In the first season, it emerges that Magneto experimented on Kurt when he was a baby, and he is adamant that Mystique not tell Kurt anything about his past. What was Magneto doing to Kurt, and why does he not want Kurt to know about it? Your guess is as good as ours; it's never mentioned again.
Toy Ship: Multiple gets shipped a lot, despite being younger than everyone.
What an Idiot: Not a life-threatening case, but a big one nonetheless. Spike honestly did a research report on Star Wars when the subject was "The Star Wars". To an outsider, that's understandable... except in high school you only get an assignment after at least five weeks on a subject! You'd have to be a major idiot to not get that!
Another Spike one. He uses his camera to record Wolverine's training session... while SKATING TOWARDS HIM! Also, his recording any mutant in general! Especially since, last episode, they mention keeping mutant activites a secret! Friggin' idiot.
The worst case in show, however, is Mystique. Even though she's typically very competent, when she lets The Juggernaut out of prison and expects to able to just order him around and just plain insults when he doesn't act obedient, even though he has no reason to listen her. This would have ended in her death if the X-Men and the Brotherhood didn't come rescue her and Xavier.
The Woobie: X-23 in her first appearance, especially when she breaks down in Logan's arms.
Kurt and Rogue also have shades of Woobiness at times, as does Wanda.
David/Legion, who was first told by his mother that his father Xavier abandoned him, then he moved to a new place where he had no friends, and then was slowly taken over by an alternate personality. An alternate personality that kidnapped and held him hostage in a castle. Then he gets permanently taken over when his dad tries to save him. Poor kid. Because the series was cancelled after Season 4, this becomes a case of The Bad Guy Wins, at least as it stands - there are hints he could've been still saved had the show continued...
It's X-Men, its one of the staples of the franchise is that (almost) every named character is a woobie in need of hugs. Scott has dead parents and uncontrollable powers, Jean has a dead friend (Not actually touched upon in the series) and powers that vary from 'too powerful to control' to 'too weak to be useful', Rogue had uncontrolable powers that she has no way of practising to use safely like others, Kurt had the whole 'my momma's evil' thing, Kitty was bullied for being too smart, Logan had no memory and was the victim to expermimentation that he still has PTSD over... And that's just the important characters.
Jerkass Woobie: Evan evolved into this. While he was probably the closest in the X-Men to Jerkassery, he developed into a Woobie during Season Three after anti-mutant sentiment caused former friends to start bullying him. While they were all suffering, Evan was the only one to be shown repeatedly being picked on for his powers. All this while also slowly but steadily losing control of his very visible powers. Eventually, he takes a Mutant harming poison (which were supposed to be a toxin eliminators) and completely loses the hang of his abilities, so the poor kid moves in with the Morlocks as, despite the X-Men's good intentions, the Morlocks are the only ones who can understand his pain. And worse, its unconfirmed if they stop being poisoned by Power8 or if the effects will ever wear off, and they never mentioned if there was a cure.
It's pretty hard to feel sorry for Pietro, what with his jerkassery and all—but then you realize that his sister hates him, his dad only cares when he needs to use him (and Pietro is painfully aware of it), and none of his friends seem to like him (though a good bit of it comes from his own actions). He's shown living entirely on his own, at 15-16, on two separate occasions in the series. It's not quite on the level with the others, but it's worth a little bit of sympathy.
The reason a lot of people dislike him is because although he's had it bad, his friends in the Brotherhood might have had it just as bad, yet aren't nearly as aggravatingly egotistical as he is. It doesn't help that his comics counterpart - while still frequently a Jerkass - was shown to possess noble traits nonetheless. Pietro also has these from time to time, so it might just be chalked up to uneven characterization with little time for good balance (especially thanks to the series' cancellation.
The problem with Pietro was he never was shown in a sympathetic light like the other Brotherhood members. Then in No Good Deed he left Lance and Wanda to essentially die. Lance was probably the closest thing he had to a friend and Wanda was his sister. Pietro was always a back stabbing traitor jerk, but that was low even for him.