I dislike the marvel movies for the same reason I dislike comic books: The focus is on making sure there is a next episode in the series, which means status quo above all else. This prevents pretty much anything interesting from happening, because significant changes have to be reverted, or previously interesting stories in the extended universe become retconned when a big budget version is made that removes any interesting elements and replaces it with generic action for "mainstream" audiences.

It's remarkable that the most controversial thing disney has done in decades is making main characters not white.

For example, in star wars, instead of doing something interesting or different, they just magicked the "first order" or whatever into existence so they could have big bad empire again, before eventually just saying "fuck it palpatine is back". They also took a back story that was left untold (getting the death star plans), rejected the expanded universe version that was about a usually ignored population having a big impact and sacrificing much for the good of the universe, and replaced it with a super generic "one important ideologically pure character plus one clearly ideologically evil villain" story with basic action.

Meanwhile in the marvel universe, they've adapted the comic book tactic of saying "multiverse and time travel and alternate realities exist" because then they can keep using popular avatar characters. This of course also means nothing freaking matters, because you can literally retcon in universe. It's so boring, nothing matters.