Iron Man2 is not good as compared to the first one. Iron Man had a good start – the Afghanistan sequence and the real life scenery (going around literally everywhere now a days). The way Tony Stark deals with them was believable at least. Not here. Here the IM is getting poisoned due to the inner core and acts just like Spidey in the second installation. This movie also goes on the lines of Spiderman 2 by getting villains from nowhere and turning a superhero into a superhero again.
Pepper Potts and the new assistant have a less role as compared to the role of Don Cheadle (previously by Terrence Howard). The villain by Mickey Rourkey is attractive but gets less time (& English dialogues too!).
Overall you feel you got less with this one than expected.