Superheros are super because they do amazing things compared to the rest of us in this world. Here however, everyone does amazing things, always, for too long. It becomes boring. There is no normal world in the background to provide the contrast, it is one (long) fantasy tale. They're all "super" so no one is super anymore. And I feel some character have lost their true nature. Iron Man for example: what defines the character is his suit of armour, high tech sure, but still "clunky" and "solid". This new nano tech suit fits and looks like a soft glove: transition from a knight in armour to a well dressed, tailored character. Of course the movie is visually striking, but again, from the first scene to the last: I got used to the visuals after about 20 minutes, the rest felt to me like repetition.