There's plenty of action and plenty of story in this direct sequel to the previous Iron Man. That keeps things moving along at a furious clip. And it makes each scene shimmer and snap with electricity, technology, and drama. The problem is that there is too much going on. Too many story threads. Too many technological leaps by solo inventor-physicists. Too many family conflicts. Too much political and corporate intrigue. Too many robots on the screen. The script could probably have been dialed back by 20-30% on all of these indices and still been a heck of a flick and easier to follow.
Even so, I liked it a lot, especially the subtle touches of Howard Stark's Disneyesque appearance and the syncronicity of his City of Tomorrow with EPCOT (and the similarity of the song "Make Way For Tomorrow Today" with "There's a Great Big Beautiful Tomorrow" from the GE/Disney Carousel of Progress).
Iron Man 2 (IMDb)