One of the MCU’s consistent big misses has been Hawkeye. In the comics he’s a sarcastic, sometime self-conscious (due to being a mere bowman in the presence of gods and super androids) hothead. He’s also one of the most highly skilled members of the team, someone Cap trusts in terms of ability. In time the self-conscious Hawkeye realizes that every Avenger has their moment and that only he’s suited for certain jobs. We’ve seen none of that personality/characterization from MCU Hawkeye though and that’s a shame. Classic comic book Hawkeye is way more interesting than ultraviolent Ronin Hawkeye ever was.
With Thor, the more MCU movies we get, the more they seem to f**k him up. That’s really awful as he’s one of the big 3 Avengers who MUST be done right imho. Thor 1 got him how I’d like him BUT he was human for far too long in that. That whole sequence with him, Loki, Lady Sif, and The Warriors Three on that frost giant realm Jotunheim was perfectly executed in terms of characterizations. I would’ve wanted more of that in the Thor movies.
I’ve said my issues with MCU Vision already in this thread.
Iron Man and Cap they really have done well in these movies. And I didn’t even like Iron Man 2 and Iron Man 3 was just ok. Cap 1-3 are high quality and they got better and better. Sure, there are MCU Iron Man and Cap pieces that don’t exactly match up with their comic counterparts but imho those differences are small and easily forgivable. The Endgame endings for both of them are perfect the more I think about it.