1) Marvel movies are inane and boring. Not remotely
2) The action is unnecessary and stupid. Completely ridiculous comment, especially given these are Superhero movies.
3) characters are rarely gone for good That is typical of comic books, but Captain America, Ironman, and Black Widow disprove your point
4) the "witty" dialogue is shallow neckbeard fodder Wow, what a bad take. Just because you don't GET the humor...
5) and the plots are devoid of anything that really captures my interest or attention That's really more of a commentary on your personal tastes. Lots of people disagree