It isn't the Avengers, it's not straight out fanservice meaning the film wasn't crafted in order to bring as much straight up "fangasms", it's a pretty challenging film for comic book fans and purists, other thant he twist you've got long stretches of the film where Tony is without costume, you have plenty of pure humour, that is not gags or references, but actual real comedy which changes up the tone massively throughout the film. It's strange and very very unexpected, it's definitely a film that deserves more than one chance because so many people will walk in expecting the film that the trailer promised only to realise its not that film at all, some people won't like it, some people will mistake the deception as a negative, but once you get a grasp on the film and what it's trying to do. I think people will understand how good this film really is.
Like i said it's challenging cinema, in my opinion the best kind.