VideoHound says: 3 Bones
In the Marvel Comics sequel, billionaire industrialist/inventor Tony Stark (Downey Jr.) has a business rival (Sam Rockwell) and the government to deal with while his alter-ego, Iron Man, has trouble with the vengeful Whiplash (Mickey Rourke). There's a lot going on, but not enough that the whole thing goes off the rails (a la Spider Man 3 [2007]). Downey's charm, and the well-staged action sequences, help keep this one just as enjoyable as the original. Rourke and Rockwell are fun as the villains. Don Cheadle does well with the thankless job of replacing Terrence Howard as Stark's buddy Lt. Col. James Rhodes.