Originally Posted by The Question
Why? If the movie is still entertaining and it comes naturally from the story then why does it matter?
When you put the name of a superhero in the title, that's not only a title but a promise. If that promise in unfulfilled you feel disappointed and/or just wondering why on earth they made a movie about a character that is not on the screen.
I would go and see a movie called "Tony Stark's Adventures" if that was what I would actually see.