- Author's Saving Throw: It's safe to say a lot of fans prefer this movie over the comic it's based on, due to removing the widely-disliked Jerkass behavior from the characters and realigning them closer to their traditional heroic portrayals, as well as cutting out the dated political commentary and undertones. It's telling that the Marvel Cinematic Universe adopted a similar approach.
- Complete Monster: "[Herr Kleiser", real name unknown, is a high-ranking general of the alien race known as the Chitauri, a race bent on dominating the Earth. First arriving on Earth and disguising himself as a Nazi general, Kleiser quickly became feared for his cruelty and efficiency, in one notable instance slaughtering a squadron of Allied soldiers with a smile on his face, before snapping the lone survivor's neck just to torture his would-be rescuer, Captain America. After failing to annihilate Washington, D.C. with a nuclear missile, Kleiser later begins orchestrating attacks on the high-tech, African nation of Wakanda, resulting in the deaths of numerous citizens, before personally and sadistically killing the king of Wakanda, T'Chaka. Paving the way for the rest of the Chitauri to invade, Kleiser leads the assault on Wakanda, massacring many innocents, while the rest of the Chitauri wreak countless amounts of death and destruction worldwide. In the end, Kleiser duels with Captain America and T'Chaka's son, T'Challa, happily taunting them both about their loved ones' deaths at his hands. Showing a power-hungry sadism not displayed by any other Chitauri, Herr Kleiser was truly the worst alien or monster the Avengers ever encountered.
- Ensemble Dark Horse: Iron Man.
- Harsher in Hindsight: Captain America and Black Widow become a romantic couple in this continuity, something that quite a large number of fans have been rooting for to happen in the MCU, especially with it teased throughout Captain America: The Winter Soldier. Sadly, as of Endgame, that's not going to happen.
- Hilarious in Hindsight: The Hulk struggling to lift Thor's hammer. Except this time he actually succeeds.
- It's interesting to contrast the philosophy of Ultimate Avengers 2 with the philosophy of Ryan Coogler's Black Panther movie. UA2 argues that isolationism is bad for Wakanda because it prevents them from getting help from the outside world (ie the Avengers), whereas Coogler's film argues that Wakandan isolationism is bad for the rest of the world because it prevents Wakanda from helping said world.
- It Was His Sled: And the man hidden behind the Iron Man armor is... Tony Stark. Everybody saw that coming a mile away.
- Memetic Mutation: Ever hear fans jokingly refer to Thor as a "chick with the hammer"? You can thank this movie for that.
- Signature Scene: The thing fans mostly remember from this movie is the utter Curb-Stomp Battle Hulk gives to the Avengers.
- Tear Jerker: Most scenes involving Bruce Banner.
- Hank Pym's Heroic Sacrifice in the sequel. Even though he has been a jerk for most of both movies, the fact he gave his life for Janet and her sobbing over his body after he apologizes while the Avengers solemnly watch is nothing short of heartbreaking
- They Changed It, Now It Sucks!: Both movies completely eliminate the extra levels of fallibility and humanity which were what made the Ultimates interesting in the first place. From a storytelling perspective there's no real reason to base these films on the Ultimate Universe if the intention was to just use regular Marvel characterization. Others can argue that this in fact improves the story as the Jerkassy portrayals eventually got downright unbearble in the comics, especially regarding Hank Pym, in addition to emphasis on their infamous moments from the classics (i.e. Hank viciously brutalizing Janet for perceived slights, Tony being a chronic Alcoholic who is drinking in literally every panel he's in, Hulk being an outright sadistic, bloodthirsty beast with utterly zero redeeming qualities, and even Steve being a very different take on a 1940s soldier, with immense contempt for France, as well as being shown to be sexist and racist). It can be argued that their traditional personalities while utilizing the Ultimates aesthetic makes for a far more appealing story.
- The Woobie: Bruce Banner, for obvious reasons;
- Cap in the first movie;
- Jerkass Woobie: Giant-Man
YMMV / Ultimate Avengers