Who would've pegged Robert Downey, Jr., as an action hero? Perhaps part of the appeal of Iron Man is Downey's unlikeliness. We never get tired of this trope: the moral fuckup on the outside is actually a hero on the inside (see also The Scarlet Pimpernel). We love to think we are capable of more than we seem to be.
In Iron Man 2, the unlikeliness persists and even intensifies as Downey's/Tony Stark's self-destructive tendencies are boosted by his knowledge that the power source that keeps him alive is fatally poisonous. However, representatives of a mysterious group appear, providing Stark with hope that an alternative power source can be found, in the process hinting to Stark that his father was also perhaps more than he seemed.
While this movie is terrifically silly, it is also a great deal of fun. Scarlett Johansson joins the cast as an action hero in her own right, as does Samuel L. Jackson. Also new to the ensemble is Don Cheadle as Rhodey, which I found kind of shocking. As if audiences wouldn't notice that Terrence Howard was Rhodey in the first installment. You'd think they would have invented a brother or something...
Worth seeing if you enjoy comic book movies, especially if you are a Robert Downey, Jr., fan.
If not, not.