The Marvel Cinematic Universe (MCU) might be the most popular media franchise in the world, but that doesn't mean it's without flaws. There have been plenty of healthy discussions about what Marvel movies get wrong. Some worry about the tone of the MCU, asking questions like, "Do the Marvel movies have too much comedy?" Others point out specific characters, plot elements, or entire films as trouble spots. In other words, although the MCU is the most loved thing in the universe right now, that doesn't mean it's universally loved.
(Comments have been edited lightly for clarity.)
The Comics Aren't Sacred
From Redditor /u/TheRedSpeedster:
As long as characters and stories are well-written, I couldn't care less about "staying true" to the comics.
The Hulk Is Actually Underpowered
From Redditor /u/JonSnow31391:
Hulk has gotten the short end of the stick lately. Hulk is supposed to be the strongest Avenger physically. His durability and strength should just edge out Thor. Thor might be more powerful, but recently the movies have shown Thor as stronger as well. Part of it was because Hulk got beaten in Thor: Ragnarok. Of course you can't have Thor lose in his own movie, but they showed Hulk being winded much earlier than Thor. I think they needed to show Thor using his lightning on Hulk a little while longer instead of just one blast.
Additionally, Hulk losing to Thanos should happen. But when the same movie shows the guy who beat Hulk also surviving the force of a full star, and then defeating Infinity Gauntlet-powered Thanos with one blow while charging into a beam from the Gauntlet, it puts Thor waaaaay above Hulk in showings.
Team Stark Was Right In 'Civil War'
From Redditor /u/ALPAMA1:
Team Stark was right in Civil War. Tony was trying to do the best thing for everybody, and Cap should have signed the document instead of being so stubborn.
And after signing the accords, and making the people feel safer and the government feel in control, then he should have gone to save Bucky, facing the same consequences in the end, but without having Tony all stressed-out chasing him.
Marvel Television Should Never Cross Over With The Marvel Cinematic Universe
From Redditor /u/datsnazzydany:
I think the television shows are beyond Kevin Feige's quality control. I love how some of the TV actors have embraced and embodied their roles. But I think with Marvel Studios actors retiring from their roles, and the Marvel roster getting smaller, it'd be smart to have cinematic versions with solo movies and different actors, with none of the baggage of the shows in portraying characters.
Marvel Television is too flawed/complex, has too much baggage, and is too contradictory/separated/R-rated to join the canon established from the films. And certain TV characters should be "rebooted" with cinematic interpretations.