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.
YMMV: The Avengers: Earth's Mightiest Heroes
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Adaptation Displacement: Google "To Steal an Ant-Man," and the first two pages of results consist of reviews, synopses, and video links for the episode with the same name. Visit the Marvel Wiki, search for the issue containing the original comic (Marvel Premiere #47), and you'd fail to find a synopsis.
Angst? What Angst?: A Skrull sent the Incredible Hulk to jail under false pretenses? Let's not try to set Hulk free, or even say how much we miss our teammate, and instead proceed with business as usual for 13 episodes (half a season's worth!).
Arc Fatigue: Those anxious to see Steve Rogers reunite with the Avengers in the second season will probably feel disappointed to know it takes twelve episodes for the Avengers to realize Steve's been replaced.
It takes thirteen episodes for the Avengers to pick up on Hulk getting arrested for one of Red Hulk's crimes. This even got lampshaded.
Better on DVD: Like so many animated shows these days the story works better as a single long narrative. Also, the DVDs mark the first time American fans can watch the first season episodes in chronological order.
This trope doesn't apply to Disney's DVDs of the second season, which started out following the production order rather than the broadcast order. (The placement of "Behold...The Vision!" after "Who Do You Trust?" in particular caused frustration.) The last volume has its episodes arranged in chronological order, albeit with the episodes set in between "Along Came a Spider..." and "Assault On 42" skipped due to inclusion on an earlier DVD.
Broken Base: The Internet practically ignited once it appeared that HYDRA had replaced Nazi Germany as the primary enemy of the Allies in World War II. When the development team confirmed that it had been made clear that they could either have realistic firearms OR Nazis appear in the series, but not both, many were content to blame the strange constricts of Executive Meddling.
"Fight as One" has people who consider it one of the best cartoon theme songs of its time, while others call it the blemish of an otherwise great TV show. However, everyone agrees that it outshines the speech used in season 2.
Marvel received a lot of flack for pushing everyone except the Big Three Out of Focus, but some of those people also felt glad to see Marvel compensate for the fact that Thor and Captain America each spent nearly all of the second season's first half separated from the rest of the team.
Funny enough, while there were some episodes that matched the low expectations (such as "Powerless!"), two arcs might as well have been two-parters, these being "Code Red"/"Winter Soldier" and the two Kree episodes.
Complete Monster: The Red Skull, as usual, embraces this trope. The leader of HYDRA in World War 2, the Skull kidnapped mystical creatures to use them to kill the Allies. When the Nazis lost, the Skull opted to kidnap Captain America's teen sidekick Bucky Barnes and torture and brainwash him into the amnesiac assassin the Winter Soldier. In modern times, the Skull continues his dreams of conquest and hatred of Captain America by unleashing a chemical compound to kill the heroes and civilians. The chemical has been engineered to cause slow and painful death by making the victim's face turn into a grotesque parody of the Skull's own.
Does This Remind You of Anything?: Hank and Janet's conversation in "To Steal An Ant-Man" about him leaving the Avengers sounds a lot like a typical breakup talk. Given who we're talking about, this is almost absolutely deliberate.
Family-Unfriendly Aesop: "Ultron-5" seems to portray pacifism as a hopeless cause, especially when Hank gives it up about three episodes later.
Fan Dumb: When the rumor started that Earth's Mightiest Heroes will get replaced by a Lighter and SofterAvengers cartoon, fans expressed shock at the fact EMH will end after episode 52. Marvel apparently told fans years ago that they commissioned 52 episodes. (Though, can you blame fans for wanting more?)
Foe Yay: A brief instance has a minor villainess Vapor sneaking a kiss to Captain America.
Queen Veranke takes every chance she gets to fondle Iron Man's exposed face.
Franchise Original Sin: During the Skrull invasion Ms. Marvel encounters a Skrull ship, and the Avengers get out of it. And, to nobody's surprise except Carol, all those Avengers were actually Skrulls. However, it's just an adaption of a similar thing that happened in the original Secret Invasion.
"Funny Aneurysm" Moment: Tony mockingly threatens to fire Clint, after Clint taunts him for messing up Carol's "welcome toast," and later finds himself in a position where he must consider actually renouncing Hawkeye's membership for possibly being a Skrull.
Harsher in Hindsight: The second season has a recurring theme of broken trust and the threat of betrayal. Consider the chance that different events from behind the scenes of this season (the retool and cancellation, the unapproved redubbing of Spider-Man, the episodes not coming to DVD in chronological order) will leave some Avengers fans feeling betrayed.
Heartwarming In Hindsight: In "Yellowjacket," Tony delivers a heartfelt eulogy at Hank's funeral. The episode was directed by the late Boyd Kirkland, whose credit appears on-screen as Tony tells the assembled heroes, "We came here to remember a dreamer."
Hilarious in Hindsight: This still  taken from the initial season two trailer was often used when showing group shots of the Avengers or promos for season two. Now that the season has aired, we see that all of the Avengers in the picture, other than Ms. Marvel, are actually Skrulls. Those darned aliens fooled us even before the season began.
Ho Yay: It seems everyone is gay for Captain America. In "Living Legend" most of the male characters had a Man crush on Captain America. There were also a few Ho Yay moments with Bucky in the episodes set in the past.
It also helped that the enemies of this episode were essentially giant, sentient spunk blobs. For real. And aside from a few awkward semi-Naughty Tentacles scenes, there are at least two shots of Cap with globs of the blob monsters on his face. And Tony's constant fanboying of him...
No kidding. The Captain America and Iron Man vibes in "The Man Who Stole Tomorrow" are practically visible. Cap was almost constantly touching Tony, the full-body scan, Tony's little smile after Cap orders him to the training room...
Captain America's greatest desire is Bucky being alive.
Hawkeye and Hulk have a serious bromance at the very least, if not outright Ho Yay. Hulk is pretty protective of Clint, shown when he threatens the rest of the team when they think Clint's a traitor, and when Bruce was rendered unable to turn into the Hulk, what got him upset enough to transform anyway? The villain grabbed Hawkeye.
Also, Hulk always refers to Clint as "Cupid" and is willing to stay with the Avengers as long as he's there.
Half the time Spiderman seems to be crushing on Cap during their team-up in "Along Came a Spider".
Inferred Holocaust: Let's reconsider the battle against Graviton. The hellicarrier and the prison inside it fell into the ocean; could they evacuate that many people? (including super-villains). The whole of Manhattan island was taken out of the ground, and then fell back: that can only generate a tsunami right next to New York, and a huge earthquake. In the battle, several buildings where destroyed or used as weapons (and nobody ever said that they were Conveniently Empty). And to finally defeat him, Thor summons a thunder that seems like an atomic explosion. And a bit of Fridge Horror: after that absolute devastation, Thor wants to celebrate that they defeated the bad guy. But well, he's a Blood Knight, and for people like him there is No Endor Holocaust.
And let's not even begin with Kang's invasion, which is a worldwide one. Explosions worldwide, blitzkriegs worldwide, killer robots worldwide... in New York alone, the focus of the episode, there are cars exploding or flying around, buildings damaged or destroyed, fires without control, the broolyn bridge was destroyed and the glasses of a small kid were broken.
When Malekith opened the casket of the ancient winters, he unleashed a worldwide ice age and released ice monsters everywhere. But, as it was magic, it may be safely assumed that when Thor closed the casket everything got back to normal (perhaps including any collateral damage caused by the ice and the monsters)
In "Along came a spider", the street collapses and falls over a subway train. The passengers who leave it are at the station and see the roof falling and run away... but what about the passengers who were still inside the train, going to some other station?
Mary Sue: Can an inanimate material be a Mary Sue? Because there seems to be nothing, nothing that vibranium can't do. One-shot 41st-century killbots? No problem. Act as climbing claws? Sure thing. Change shape into different weapons? Prepare to be amazed. Exorcise evil spirits? ...Well, at least it stuns 'em. We should have realized it would turn out to have Sue-like qualities when we saw that it was purple.
Misblamed: Some fans assumed that Yost and Fine originally wanted to resolve the Surtur storyline in the second season finale, but that Loeb's Retool changed the foe to Galactus. However, Fine would later say that he and Yost actually wanted the Avengers to fight Surtur in season three. Suggesting that Loeb completely rewrote the second half of season two to leave that arc hanging now seems a bit harsh. If you don't mind admitting that Yost and Fine did something wrong while in control of EMH, this issue actually seems like their fault, for trying to foreshadow a third season before finding out whether or not they got an extension on their two-season deal.
Most Annoying Sound: If you already do a good job keeping up with the episodes, "Previously, onAvengers...". It doesn't even sound like Marvel got one of the show's regular voice actors to say it, unlike the replacement intro.
Mondegreen: Captions for season one butcher "Fight as One" so severely that it no longer rhymes.
Our world's about to break/Tormented and upsetnote attacked/The lossnote Lost from when we wake/With no way to go back
But severalnote Assemble we are strong/Forever fight as one
Padding: Sometimes the recaps opening season 2 episodes give information that is repeated in the episodes themselves and/or ultimately unnecessary for enjoyment of the story.
Older Than They Think: A few fans thought that M.O.D.O.C. being changed to "Mental Organism Designed Only for Conquest" (rather than "Killing") was a result of Disney buying Marvel. When in fact, it had previously been changed in the all-ages series Marvel Adventures: The Avengers BEFORE Disney bought Marvel. Never mind how it was more in-line with his personality anyway.
One-Scene Wonder: The heroic version of the Black Knight makes a brief appearance in Come the Conqueror, shown defending London from Kang's forces.
Periphery Demographic / What Do You Mean, It's for Kids?: Some people didn't know this was supposed to be a children's show on Disney XD while streaming episodes where the XD logo did not appear. It helps that it had solid plots, a radar that got flipped off quite a few times, and was faithful while being pragmatic. Unfortunately, the popularity of the show with teens and adults came at the expense of kids not liking it, causing the show to be axed.
Seasonal Rot: The second season has several great episodes, but it also suffers from having more filler than the first. The retooled portion, in particular, has so much filler, that subplots the original writers set up earlier went unresolved and/or unexplored by the time the show ended. This season also saw most of the Avengers get pushed Out of Focus, and Out of Character Moments become more frequent. Plus, the animation sometimes seems cheaper, and the awesome theme song permanently got ditched!
Tainted by the Preview: Responses to the second season's official trailer include comments on the line of, "This show looks sweet, except for the fact it has Red Hulk." Though it's not an issue for some.
The first season's trailer, which includes text stating that the team is "led by Iron Man", elicited disappointment from people who wanted a show about Captain America leading the Avengers. However, other people point out that in the early episodes, Cap hasn't adjusted to modern society well enough to become head of the team.
There's also the fact that this show started with the original line up and Iron Man was the original leader in the comics, although here Tony isn't a very strict leader and often listens to ideas better than his without too much ego.
Take That, Scrappy!: For anyone displeased by Hank Pym's Yellowjacket persona, Abigail Brand punches him hard when he smirks that he waited to shrink a bomb that would blow up a SHIELD prison.
They Changed It, Now It Sucks: Fans were not pleased when they tuned in to episode 20 on Disney XD, saw the new intro, and noticed over half of the theme song got replaced by Nick Fury's voice actor glorifying the first four Avengers to receive solo live-action movies. Fortunately for them, the versions that play in other countries boast the uncut theme song. The versions that became available to legally download, stream, or own on DVD also have the full theme.
Episodes from the second season appear to have the movie-promoting intro no matter where you watch them.
Ultron defeats the Hulk by turning him back into Bruce Banner. Meanwhile, an unarmored Tony Stark is trying desperately to abort a nuclear apocalypse. Does genius nuclear physicist Bruce Banner help Tony hack the computer, giving him a rare chance to shine and making Ultron's defeat partially due to his own mistake for assuming an ordinary human couldn't be a threat? No. Bruce just lays unconscious the rest of the episode.
A terrible example in "Powerless!", the first episode of Man of Action Studios' Retool to air in Australia. Knowing that this marks the last time Surtur appears in Earth's Mightiest Heroes, you might expect to see the Avengers do an epic battle with him, but you won't get that. You won't even get an un-epic battle with Surtur. Instead, you get an Anvilicious tale in which the Big Three get Brought Down to Normal, then regain their abilities after Thor learns a lesson in humility. (Thor already lost his arrogance over the course of season one, making this episode seem like a waste of time.) Granted, viewers at the time didn't know this would mark the last they'd see of Surtur, but one can't easily imagine MOA and/or Marvel not knowing that.
As a possible testament of the poor reception of the episode, Disney XD has decided to premiere this episode on DVD instead of on TV.
Due to the aforementioned order by S&P to remove the Nazis as the WW2-era villains, the map in "Meet Captain America" has Hydra sweeping in from the east... Russia to be exact, steamrolling Poland, then Germany in their advance. Bonus points to anyone who can see both what's wrong with this picture, and which large country which lost 20,000,000 of its population fighting off a German invasion might be offended by the implications....
It gets worse because at least when Cap asks the 616 (comic) Universe "we won, right?" they can give a definitive yes since the Nazis are gone but when EMH Cap asks if Hydra is gone...
Steve: So, we won the war.
Tony: Thanks in part to you.
Steve: So, HYDRA's gone?
Tony: Uh... it's complicated.
BUT!! the producers have gone on record to say they what to imply that HYDRA is a branch of the Nazis. So this means that they are the Ghostapo.
Should be noted that in the comics history, HYDRA originated in Japan, albeit it didn't reach the clout it did until Baron Strucker took over.
On the cover for the second DVD, it looks almost like Captain America and Hawkeye want to beat up Black Panther ().
Anvilicious: The miniseries delivered morals of putting aside your differences and learning to work together in a more heavy-handed manner than the cartoon does.
Jump the Shark: The comics became less interesting after Chris Yost stepped down from writing them.
Needs More Love: Chris Yost's comics complement the show well, even better than the retooled portion of season two at least.
Squick: MODOC and a minion agree in "Mind Games" that MODOC could use a stronger body to complement his intellectual strength. MODOC then wishes for a body like that of Thor, Hulk, or...She-Hulk.
They Just Didn't Care: Oftentimes Avengers wear their season 1 costumes during comics that clearly take place during season 2 or later.
They Wasted a Perfectly Good Plot: In one issue, Magneto, thinking Wasp is a mutant, tries to recruit her into the Brotherhood. When Wasp makes it clear she isn't a mutant (anyone who's read the WMG page would know that alone fits this trope) the rest of the issue focusses on Avengers vs Brotherhood. Do we ever see the Avengers reaction to the anti-mutant protesters with the "No Mutant Avengers!" signs, or how wrong they think it is? Nope, we just keep hearing about what a Jerkass Magneto is for being a Well-Intentioned Extremist.