"Iron Man 2" is not the perfect sequel to his predecessor, which was surprising and exciting. This movie suffers the need of building a future for the at the time young Marvel Cinematic Universe and therefore there too many contents to deal with. There is the development of the main characters from "Iron Man", in particular Tony's arc is quite important, but at the same time this movie introduces two more superheroes meaningful for future films. Then there are new villains which came out a bit superficial and finally there are some dipersive subplots. But this overload of content doesn't result in a disastrous movie thanks to the use of the atmosphere which made the previous film so great. The second installment in the Iron Man saga is not as great as the first one, but it is a decent film penalized by his necessity to expand more than his capacity the MCU.