I never go into a superhero, sci-fi or popcorn/blockbuster movie expecting any plot twist, deep social commentary or groundbreaking performances. I was honestly surprised by Daredevil because it was a different tone for the MCU, but I don't expect that as the norm.
If the movie delivers higher than my expectations, I'm happy. If it gives me what I signed up for: well choreographed action and a plot that makes sense in the reality that it takes place in, I'm about equally happy.
I don't get how after years of dumb comic book movies dating back to Batman, where toxic goo made a criminal into a laughing hyena man, people go in expecting to be blown away. Are there low brow movies in this genre that insult the intelligence of the audience? Absolutely. Transformers comes to mind. But I just charged that one to the game and avoided the sequels. If Avengers AOU is at least on par with the original, I'm happy and will go see Ant Man and everything that follows.