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 West Coast team was split up shortly after Mockingbird's death, with Steve citing the team's problems and changing roster as a problem—hardly surprising when one member had been killed two issues ago, and Hawkeye had left because he couldn't stand to go back to the compound due to it being their first home as a married couple. Outside the West Coast Avengers, no one even seemed to remember she existed, let alone that she'd been killed.
Bill Foster/Black Goliath was quickly forgotten by everyone who wasn't Hank Pym, including Reed Richards and Tony Stark who were at least partially responsible for his death (having created the clone of Thor that killed him.)
Author Appeal: George Perez designed a new costume◊ for the Scarlet Witch, which reveals that she does not wear panties.
Several attempts to upgrade the team for the nineties were hated by fans: the Wasp turned into a weird monster◊ (or whatever), Thor with chains and a naked chest, several characters with leather jackets, Deathcry... and let's not remember more. They tried to fix all this by sending the characters to an alternate universe in "Heroes Reborn". The fix was even worse than the original problem. So they aborted the whole Heroes Reborn thing and gave the title to Kurt Busiek, who sent the whole "nineties" stuff to the trash bin and restored the classic Avengers.
After poor writing for issue #200 made it seem like Ms. Marvel was brainwashed and raped, and we were supposed to see it as romantic, the following year saw her give a blistering What the Hell, Hero? speech to the team for not realizing she was still brainwashed when she agreed to go off with the guy.
Creator's Pet: Roger Stern really liked Monica Rambeau, and actively pushed her into the limelight. He repeatedly had other characters talk about how powerful she was, men gushed over her beauty, and she was even made chairman of the Avengers for a time. The fans never quite took to her, but she was never really hated. She did develop a larger fanbase once Warren Ellis made her a member of the Nextwave series.
Some characters in Brian Michael Bendis' Avengers comics - Spider-Woman, Luke Cage, Jessica Jones and Ares - are accused of being Creator's Pets. There is some balance though, because Bendis has a tendency to showing his affection by heartlessly breaking them, so all five went through some serious crap under his care. But for many fans it's still not enough to equal all the attention he gives them. And that's not counting Bendis' "love" for Hawkeye, who has become nothing more than a vehicle from which Bendis attacks his critics (and to spite fans whose overwhelming hatred for Bendis' attempt to permanently kill Clint off led to Bendis being forced against his will to bring him back to life, at which point he turned him into a ninja to further spite fans).
Dork Age: The team in the immediate aftermath of Operation Galactic Storm. Bob Harras wrote The Gatherers story well but the roster was horrible to the point where Black Knight, Black Widow and Vision were the only popular characters on the team since Captain America and Iron Man both decided to focus on solo adventures and Thor left soon afterwards while Wasp and Hank Pym both decided it would be a good time to go MIA. The West Coast Team fared slightly better with War Machine, Hawkeye and Scarlet Witch but the franchise was overrun with C-list heroes until Captain America rejoined the vanilla team at the same time that Deathcry joined who many consider to be the worst Avenger of all time. This led into the widely reviled (although well drawn) The Crossing series which made Iron Man evil then killed him and replaced him with his teenage self. It was a change so unpopular that it took killing the nearly entire roster of Avengers in the Onslaught crossover (exceptions being War Machine, Quicksilver, Spider-Man and partially the Hulk) to reboot them in the alternate Heroes Reborn universe which proved so unpopular that Marvel performed a second reboot after only 12 issues. Thankfully Kurt Busiek's reboot worked and restored the franchise to its former glory.
Ho Yay: Sunspot & Cannonball, in Jonathan Hickman's run on the book, are never seen apart & their dialogue has been noted as being so filled with homoerotic implications that it could be given to gay couple & no-one would notice.
My Real Daddy: Roy Thomas; Stan Lee and Jack Kirby may have created the title, but Thomas created two of its major recurring villains — the Grim Reaper and Ultron — and introduced a number of ideas, characters, and tropes to the franchise that are used to this very day.
For Quicksilver and the Scarlet Witch, being members of the Brotherhood of Evil Mutants. For, what, 2 or 3 issues before resigning?
Scarlet Witch has a lovely new one in the form of "No More Mutants". Those three words have come to more or less define her character and direction, to the point that it's rare that any aspect of her life other than the Decimation is brought up. Does she even have a brother anymore?
For some time, the Black Knight, Iron Man or the Avengers in general were blamed for the Nega-Bomb that destroyed the Kree Empire (which was not their doing), and the execution of the Supreme Intelligence (which was their doing, but the Supremo was actually Faking the Dead).
The rest of the Avengers blithely accepting Ms. Marvel going off to be with a guy who brainwashed and raped her. Notably, this was later subject to an Author's Saving Throw by Chris Claremont, who hated the idea from the start.
One of the deeds Loki will always be remembered by is bringing the Avengers together, to the point that some adaptations have put a different spin on this.
One-Scene Wonder: Pilot Marko appears for about five pages in Secret Avengers #17, and you are about to read every word he's ever spoken, but he steals the book.
Pilot Marko: Yes! Pilot Marko shoots stupid Yankee zillion-dollar plane right in its stupid bluddy face! Where is your bluddy Steve Jobs tricknology now, Rich Yankee Pigs with your tight pants?
Valkyrie:(activates Extreme Separation Protocol)
Pilot Marko: ...They throw bluddy airplane bum at Pilot Marko?
Protection from Editors: Brian Bendis, whose tenure on the title has seen him being able to do as he pleases, which has not been received favorably by all. Not helped by the fact that the only two Avengers books he didn't write in his tenure were Secret Avengers & the Dark Reign-era Mighty Avengers books. Notably, as he began finishing up his time on the franchise, certain aspects of his run were undone - namely, the deaths of several longtime Avengers, & Scarlet Witch was (Partially) absolved of her roles in the Disassembled & House of M storylines.
So Bad, It's Good: There was a story with a villain called Immortus, whose power is that he can summon up mythical and real historical figures to fight for him, like Merlin, Atilla the Hun, Goliath and... Paul Bunyan. Yes the Executioner vs Paul Bunyan. I am not making this up. Unfortunately (or fortunately?), Immortus was more toned down in later appearances, being known strictly as a time travelling villain..
Actually, all the early Avengers stories are like that to one extent or another. It's when the team lineup changes for the first time that things start to actually be good. It really doesn't help that the earliest stories have the team treating it like some kind of secret club, with regularly scheduled meetings and having hissy fits when a member doesn't show up (in one very early issue, Iron Man was even banned from the team for a week because he missed a meeting).
Strawman Has a Point: Since her return, Scarlet Witch has been attacked by several of her teammates for the events of House of M, even though The Children's Crusade established that she was possessed and manipulated by Doctor Doom. Her critics (namely The Vision and Rogue) are made to look like massive Jerkasses for attacking her, but House of M wasn't the first time Wanda lost control of her powers. There is definitely some logic behind the idea that having her on the Uncanny Avengers might be dangerous and counterproductive to the team's mission statement.
They Changed It, Now It Sucks: Basically every single line-up change in the fluid roster has gotten some criticism, but Rob Liefeld's "Heroes Reborn" stand out in terms of negative feedback. The line lasted for only 12 issues, and Liefeld was fired even sooner than that.
What Do You Mean, It's Not Political?: 1960s, there is a special comic book character. A black superhero, named "Black Panther". What do you mean that it is not a veiled reference to the Black Panthers? No, really, it is not: Stan Lee and Jack Kirby created the character first. There was even a brief attempt to rename the character as "Black Leopard", to escape from the confusion, but it was short lived. Until the late Eighties, the character was almost always referred to as either 'Panther', 'the Panther' or T'Challa (his name), in order to avoid the implications of the name.
According to "Comics Should Be Good", it's actually just a coincidence that the two have the same name and became prominent at the same time.
Despite the name, the crossover Operation Galactic Storm has no similarity to the contemporary Gulf War, codenamed "Operation Desert Storm"
The Woobie: Carol Danvers. First she got powers during the explosion of a Kree machine, became a super-hero, and joined the Avengers. Everything was fine... and from there, down she goes. First, she is abducted, drugged and raped by the son of Immortus, who left her pregnant to be "born" on Earth (long story...). She returned, and the evil Rogue stole her powers and memories: Charles Xavier helped her to recover her memories, but not her emotional link to them. Then she was abducted by aliens, who unleashed great power in her, and she became Binary, but she lost this power as well. Once more with just the power of Ms. Marvel ("Warbird" by then), she joined the Avengers. But her refusal to point her loss of power (which almost led to disaster in battle), and her alcoholism, got her court-martialed and expelled from the Avengers. The Scarlet Witch created an alternate reality where she was the greatest super-hero... but things got back to normal, and she's just another super-hero of the lot. She returned to the Avengers, only to witness their breakup during Civil War. She took the side of Tony Stark, and had to hunt her old friends... and then, Stark was replaced by Norman Osborn, and she had to join those Avengers she was hunting. Even worse, Osborn included Ms. Marvel in his team... who was actually Moonstone using her first costume.
Wasp, though she crosses into Iron Woobie: Her dad died, to kick things off, but she didn't let that get her down too much. Then she joined a superhero team only to be regulated to Distressed Damsel roles and ignored due to being the weakest member of the team. Then her personal chauffeur starts making advances on her until eventually trying to kill her and Hank or her money; said chauffeur, it turns out, being Whirlwind, a villain that constantly kicks her ass when they battle, who's since developed an obsessive crush on her. Then she marries Hank, only for him to be in the middle of a psychotic break that is partially her own fault, eventually resulting in a painful string of events that involve her getting slapped across the face and knocked to the floor, forever turning her into a poster child for domestic abuse in comics. THEN, she spends the next bit of time recuperating from that and dealing with a messy divorce and, when her and Hank start to patch things up, she's attacked and almost raped by Whirlwind, who's crush has turned him into an obsessed psychopath. Then, after not being allowed to do anything for a while, she's used as a Sacrificial Lion during Scret Invasion. During which, she's secretly lost in the Microverse, fighting for her life.
Alternate Character Interpretation: Between Thor and this movie, Loki's tactics change from "Silvertongue" to "ranting villain with an army" and his eyes change colour (green to blue). That and some of his dialogue with Erik Selvig about their experiences with the Tesseract could be read as him also being under coercion from the Tesseract/Staff, if one wanted to do so.
Anti-Climax Boss: Years of superhero movies have taught viewers to expect that a final battle between The Avengers and Loki would happen towards the end of the movie. It doesn't happen quite that way.
Award Snub: Neither Disney nor Paramount created a For Your Consideration... Oscar campaign. As a result, no one from the cast and crew received nominations, except for the visual effects artists. The victory of Life of Pi in Visual Effects left the Avengers ultimately empty-handed.
Designated Hero: Following the release of Man of Steel, in which a number of people felt that Superman played this trope straight, the Avengers have been getting these accusations for not doing more to protect the people of New York.
Though admittedly they did all they could to contain the damage to a few blocks, whereas Superman didn't.
Draco in Leather Pants: Search for Loki on Tumblr. The fangirls have gone nuts about Loki ever since the first Thor film, to the point that some have said, without a single trace of irony or sarcasm, that he's the real good guy and all his misdeeds should be automatically forgiven. Yes, this includes his attempted genocide of humanity. It's a character interpretation shared by Tom Hiddleston, incidentally. He thinks Loki needs a big hug.
Dude, Not Funny!: Several of Tony's comments that make light of Steve's tragic situation ("You're spry for an older fellow," "I guess you missed a few things doing time as a Capsicle") and Thor's line about Loki being his adoptive brother, to some.
Loki, coupled with his Draco in Leather Pants status, has garnered quite the fan following. Before this movie, Loki wasn't well known to non-comic book fans, and was even something of a niche villian due to Thor not being an outrageously popular individual title. Suddenly Loki is as popular and revered as Magneto or Doctor Doom.
The Other, who serves as the Mouth of Sauron for Thanos. His intimidating design and performance has caused several fans requesting that he appear again in a future Marvel film. The fact that he's a Canon Foreigner helps to leave his true powers a mystery.
This can also be attributed to the fact that the two are perfect Foils. Dark Knight Rises is bittersweet, theme-driven, introspective, gritty and realistic, while The Avengers is triumphant, runs on action scenes and Rule of Cool, and fully embraces the Magitek fantastical world of the Marvel Cinematic Universe. This means that which film is objectively "better" is a very tricky question to answer because they are so entirely different.
Fanon: The shawarma scene in The Stinger had to have happened before Thor and Loki returned to Asgard, which raises the question of where Loki was while the Avengers were eating. Some fans say he was in SHIELD custody. Others say he was chained to a parking meter outside.
Steve: Big man in a suit of armor, take that off and what are you? Tony: Genius billionaire playboy philanthropist.
It's mentioned that Captain America is o a SHIELD watchlist as potential threat. It's Played for Laughs at the time, but then Captain America: The Winter Soldier reveals that HYDRA has been active inside SHIELD for years. Captain America is their old enemy. Odds are good that they put him on that watchlist.
Back in Iron Man 2, the last thing Nick Fury said to Tony Stark before they meet again after the finale is "I've got my eye on you." Which was after assigning Agent Coulson to monitor him, whom we hear Nick Fury refer to as "my one good eye" in this movie.
Inferred Holocaust: Much of Manhattan is wrecked in the climactic fight. Though only bad guys are shown dying, the death toll is probably in the thousands, and a memorial is briefly shown in a news report afterwards.
The UK DVD/Blu Ray release is undergoing this for two specific reasons.
The editing of Agent Coulson's death, by digitally removing the tip of Loki's spear penetrating the other side of his body when it was present in the theatrical release. This isn't helped by the BBFC commenting that they were unaware of any changes to the film, and any such changes would need to have the film undergo classification again; and Disney UK's denials of any editing taking place, and that everyone who saw the film is mistaken when they claim that the tip of the spear was visible in theatres, despite the BBFC classification explicitly mentioning the scene as being in the film.
Few people really believed that Iron Man was going to kick it.
As well as Hawkeye shooting Fury in the first 5 minutes.
Both of these overlap with Interface Spoiler: thanks to the internet we know that these actors were contracted for one more movie and four more movies respectively, and you do not relegate Samuel L Jackson to flashbacks for four whole movies.
Captain America's line "I understood that reference" is often posted in online discussions as a reply to a cultural reference that says "I see what you did there". note Frozen for seventy years, Steve Rogers is a Fish Out of Temporal Water, which is especially clear when Tony Stark makes several pop-culture references. When Nick Fury refers to the "flying monkeys" from The Wizard of Oz, Steve seems inordinately pleased to hear something he can relate to.
"That's my secret. I'm always ____." An Image Macro of Bruce Banner saying this line (with the end changed for the poster's point; "drunk" "hungover" "horny" or whatever.)
"I have an army." "We have a Hulk."
And its variations, such as 'We have a Coulson'.
Also, variations of this piece of dialogue:
Steve Rogers: Big man in a suit of armor, take that away and what are you? Tony Stark: Genius billionaire playboy philanthropist.
There's also Thor's laugh after that exchange in the trailer.
Misaimed Fandom: Loki calling Black Widow a "mewling quim" ("whimpering cunt," in more modern vernacular) is supposed to establish that he's a nasty, unpleasant, misogynist villain. Either because the language was too dated and silly-sounding, or because fangirls will forgive anything if the guy is hot, that didn't happen.
Music to Invade Poland to: Technically, Loki's invading Germany, and only as a distraction. Still, two seconds after he starts a buttkicking rampage set to the tunes of Richard Wagner, he's pretty accurately compared to Hitler.
Harry Dean Stanton as the security guard. "Son, you've got a condition."
The old German man who stands up to Loki.
Thanos. One non-speaking appearance in The Stinger, but to some comic fans, he's one of the most memorable parts of the movie.
The Galaga-playing SHIELD agent, despite only appearing for five short seconds.
Rescued from the Scrappy Heap: The Hulk. Two previousattempts to bring the character to the cinema screen proved somewhat lackluster, the role got recast once again, and the character had already developed a reputation of being the most boring of the team. However, a combination of Mark Ruffalo's performance and clever screenwritingnote And the hilariously awesome "Puny God" scene turned The Hulk into an unexpected favorite of the movie, making the possibility of a new Hulk film much more likely. Might be one of the fastest turnaround times for this ever. Shortly before release, producer Kevin Feige said there were no plans for a Hulk movie. Shortly after release, it was let slip that a Hulk movie may be in development for 2015 and that Mark Ruffalo had signed on for six more films.
Really, it's that Mark Ruffalo's interpretation of the character is that Bruce Banner is a normal guy who's got issues instead of the emotionally-stunted, severely repressed individual of the previous films who was constantly scared that he'd flip out over everything. Likewise, his version of the Hulk isn't that he's a barely controlled rage monster; his casual Offhand Backhand of Thor after they brought down a Chitauri Leviathan and his smackdown of Loki shows us that the Hulk is really just an irritable jerk (albeit with a heart of gold) who just happens to have superpowers.
Lampshaded, in the commentary, and then averted for that very reason. During the Kneel Before Zod scene in Germany, Joss Whedon realized the unfortunate implications of all the Germans kneeling, and so he added the old man to defy Loki, thus turning it into a Crowning Moment Of Awesome. He also made sure people started getting up after Captain America arrived, so that Cap wouldn't be standing above them but with them.
Thor's quip about Loki being adopted offended a number of people on the grounds that it demonized adoption:  A number of people, including adoptees, felt it was fine: 
Ship-to-Ship Combat: Due to the large Slash fandom and heaps of Ho Yay, pretty much every Avenger or SHIELD agent in the film has being attacked for being in the way of a pairing with one of the others.
Due to the Platonic Life Partners relationship between Hawkeye and Black Widow, and the very Ship Tease like moments between the two, comic book fans that ship Hawkeye with his ex wife Mockingbird have gotten fairly aggressive towards Widow. Likewise, fans of Widow and Hawkeye have been tossing unending heaps of hate towards Mockingbird for the crime of the two breaking up.
On the Natasha side of things, comic fans who are invested in her current relationship with Bucky Barnes are also bitterly against the movie fandom shippers of Clint and Natasha. This heated rivalry exploded with the announcement that the next Captain America movie will be Captain America: The Winter Soldier, and will feature both Bucky and Natasha, with no news of Clint being involved.
The tangle did not get any neater after it was announced that Mockingbird would be appearing in Agents of SHIELD, with a number of Clint and Natasha shippers deciding that they will be fine with Mockingbird existing as long as she and Clint never meet.
So Bad, It's Good: A tie-in for the film made for Wyndham Resort hotels features the Avengers fighting Ultron, then splitting up to go on vacation. The writing is lackluster and cliché, reading like a bad 60's comic book but with modern artwork. This makes it unbelievably funny. Also worth mentioning is Tony, in Iron Man armor, eating at a buffet and what can only be called Bored Hulk.
Troperrific/Cliché Storm: It wasn't lost on several critics and movie goers that The Avengers, for all of its praise, hardly broke new ground in superhero movie storytelling (especially compared to The Dark Knight and Watchmen). It's more than a bit predictable, and every convenient plot twist unfolded in the way most people would expect after viewing one too many superhero flicks. Still, because The Avengers blended the best elements of superhero movies together, this is an exceptional case of Tropes Are Not Bad for many.