Call me a geek, but the attitude of your comment really does these movies and their fans a disservice. For example Captain America and Ironman are two characters that have had very clear character development arcs that reach their conclusion in this movie.
These arcs have something to say about the human condition, how people are motivated and how those motivations change their actions. Those stories are wrapped in dazzling superhero costumes, but like the Greek myths, the Geek myths are reflections on our humanity.
Dude, it’s a comic book movie with a walking tree and talking raccoon in it.