Completely fine, actually

Rating: 9/10 (23 August 2015)

This film frankly is unnecessarily complained about, to a hilarious degree. The action of Iron Man 2 is both entertaining, although the sequence in Morocco is a bit too full of hesitations, and it has as much a plot as....well, any other movie that Iron Man is in does. Also, and though this won't probably be noticed the first time watching the film, Sam Rockwell's character is notably well acted. Hammer on screen contrasts greatly from Bridges' Obadiah Stane character, providing nice a anti-Stark-businessman contrast.
Even furthermore however, this movie in ways like an MCU-exposition-pillar for the whole MCU-series; and not in a conspicuous okay-there-was-some-obvious-exposition-right- there way, but rather in ways that are either realized later or realized when the watcher looks closely. By "MCU expostion" I mean hints that tie this and that together that are findable in the film, or the introducing major MCU characters, such as Romanoff and Coulson (who was very minor in IM 1).
And lastly, without the humorous and detailed Senate hearing scene at the start, Iron man/Tony Stark's persona and public stance regarding his Iron Man essence would be a bit vague. If the Iron Man movie series was simply Iron Man 1, (Avengers), and Iron Man 3, there would be plotwise an enormous hole - larger than if, say, Iron Man 3 were to be "erased" from film-existence.