It depends upon whether or not the flow of the story of Iron Man 2 draws you to Thor rather than The Incredible Hulk. While all the three movies overlap chronologically, there are two, at minimum, in-story cues to bring the narrative of Iron Man 2 directly into Thor. This is what I'm talking about when I bring up story flow reasons. Thor the Dark World leads directly in the Guardians of the Galaxy and Captain America the Winter Soldier leads directly into Avengers Age of Ultron? Switch them.I think the only thing I'd flip in release order is to put Iron Man 2 ahead of The Incredible Hulk. The final scene of the latter doesn't really make a whole lot of sense when it's revealed in IM2 that SHIELD are still trying to convince Stark to work with them.