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.
Broken Base: A large number of reactions to the first-released footage of this new series were quite mixed. Some are cautiously optimistic, others aren't sure about the new direction, and others more just flat-out hate it.
Not everyone seems pleased that Avengers from the previous shows such as Black Panther, Hank Pym and Ms. Marvel are not included.
The news that most of the main cast was being replaced did not go over well either.
Creator's Pet: Tony Stark. Unlike in The Avengers: Earth's Mightiest Heroes, where there was a reason he started out the leader of the Avengers instead of Cap, there doesn't seem to be a definitive reason why he's the leader despite Cap continuously showing more affinity for the job. Too much of the series is spent on Tony angsting about his leadership skills, and when he does comes up with strategies, it usually comes at the expense of the other Avengers' collective intelligence (the more egregious example being the finale of the two-part pilot). Not only does Tony get the leadership mantle and the bulk of the storylines, but he also gets Steve's canon best friend (Sam Wilson) and canon nemesis (Red Skull).
Foe Yay: Black Widow with Dracula, Doctor Doom, and Impossible Man (though he's not really evil).
The constant winks that Hawkeye gets from Hyperion in the latter's debut episode, Hawkeye's insistence on wanting Hyperion to join the Avengers, and Hawkeye giving a wink to Hyperion himself when the latter is distracted. Later Hawkeye receives a wink from Thor.
Lampshaded by Hulk.
You like him...because he winked at you?
Idiot Plot: Falcon's sub-plot in One Little Thing. Having been keeping his Avenger status a secret from his mother, he gets everyone to pretend that he's a mere SHIELD liaison to them. At the same time, the tower is in a crisis with runaway Pym particles. Falcon desperately tries to pass the chaos that follows off as a training exercise. This despite the fact that the tower coming under attack has nothing to do with the fact that he's really Falcon. Then, when it falls down to him to fix the problem, he keeps on pretending. This despite the fact that him being smart enough to fix the problem has nothing to do with the fact that he's really Falcon. Then, when he does go in with the device to save the day, Falcon, for whatever reason, comes in with full costume and the truth comes out. Falcon could have gone far longer, if not the whole episode, without having to 'blow his cover', and there was no reason at all for him to keep the main plot a secret too! All in all, the subplot just comes off as extremely forced.
Inferred Holocaust: In "Depth Charge", Attuma and his army flood New York and the entire friggin' subway system. Despite this, no mention is ever made of any casualties, nor do we ever see anyone outside during the crisis. They try to pass it off in the beginning with an offhand mention that they evacuated the city, but let's face it, no one is going to fully evacuate everyone in New York City.
Hyperion crossed it when he blew up his own planet just because his people wouldn't submit to his ideal.
If there's any doubt that he's crossed it, it's put to rest in Exodus when it's revealed that Red Skull was about to massacre hundreds or thousands of his troops and his allies for the sake of power. The rest of the Cabal themselves are horrified at this new low of Skull's.
Red Skull calling himself The Iron Skull and saying it so proudly. It probably took him all of five seconds to think of it.
Iron man apears equally imaginative with, calling the Doom controlled Destroyer the Doomstroyer.
Black Widow saying "Hate you", and Hawkeye replying with "Hate you more!", whilst both are under the influence mind-controlling nanobots. But really, mind control shouldn't reduce their level of wit to that of 10 year olds.
Since the show tries to use the updated, realistic movie designs while adding elements from the comic the movies haven't redesigned yet, the contrast between the two styles can sometimes be so blatant it gets ridiculous. Best example would be Falcon, who is wearing his spandex-like colorful original suit... while every other Avenger has his movie design.
The flashbacks with costumes and characters designs from The Avengers: Earth's Mightiest Heroes in the episode "Molecule Kid" can be considered an attempt to please fans of the said show. It didn't work- for the most part, it just ended up confusing them even more.
Replacement Scrappy: Falcon. While he isn't necessarily considered a bad character, pretty much everybody agrees he's a step down from the characters in Earth's Mightiest Heroes, especially his predecessors Wasp and Black Panther, who had much more interesting backstories, personalities and abilities. Not helped by how Falcon's integration is very rushed, with very little development: He is introduced briefly as Tony's protegee, comes to help the Avengers, and then get fired by Fury for insubordination only to be recruited in the Avengers as a result the very next second, without any discussion about it between the older members.
Bruce Banner is mostly absent from this show except for "Planet Doom"; this incarnation of the Hulk apparently stays transformed permanently (and unlike in Earth's Mightiest Heroes, no explanation is given why), and, since he lacks the Jekyll and Hyde Split Personality, is reduced to a Dumb MuscleBlood Knight whose most dialogues can be summed up as "Time to smash" or "Give me something to hit". Especially surprising considering this show tries to emulate the spirit of the Avengers movie.
Black Widow seems to be heading that way. While it is reasonable not to have every Avenger in every episode, Black Widow seems to be the one member who is frequently absent from the series to the point where some people question why she was added to the roster, other than she happened to be in the movie. Some reviewers and fans have even criticized her having a generic personality and ignoring her comic and cinematic portrayals.
In "Blood Feud," the Avengers face off against Dracula in an absurd story with rife with Hollywood History when the producers could have used an already established vampire Captain America enemy, Baron Blood, with minimal rewrite.