I like them as long as they do something different. GotG and CA2 in particular stand out for being superhero movies under the trappings of other more interesting genres (space opera and conspiracy thriller respectively). In contrast, Iron Man 2 and 3 are nothing but average superhero movies, ones that feel like Marvel was playing it safe. Same with Edward Norton's Hulk, Thor, Green Lantern, Amazing Spider-Man, Man of Steel etc. I think the fact that I need to find something else to latch on to is evidence of me being kind of sick of them at this point, but the last two Marvel movies I really liked so... I guess I'm conflicted.
On the other hand, in terms of what superhero movies have done to the blockbuster film industry, I can without reservation say that I fucking hate them.