Director Jon Favreau expands his mileu and enhances his aesthetic with an Iron Man 2 (B+) that builds on the giddy spirit of the first and allows Robert Downey Jr. to continue to hold court over gab and gadgetry. It’s a rip-roaring actioner with an even more personal story, higher stakes and an all-star supporting cast including Mickey Rourke as a villain and Scarlett Johannson and Samuel L. Jackson in Avenger roles. Gwyneth Paltrow returns, and Don Cheadle takes over the role originated by Terrence Howard. All in all, it’s a sensational sequel success.