Last night I saw Iron Man, in a packed theater in Sierra Vista (where, take that, city dwellers--tickets are still $6.50!). I'm not certain yet, but I think it might have been the best superhero movie I've ever seen (not my favorite, which will always be the Adam West Batman movie, but the best). Downey is definitely the best actor I've seen in a superhero role--he made Tony Stark his own, kept the character interesting and entertaining, and remained true to the Tony from the comics. The action sequences were good--a little jump-cutty, as they almost always are these days, but not so much that you couldn't usually tell what was happening. The flight sequences were terrific, and convincing. There was plenty of set-up for a sequel but it felt natural, not forced, and the movie was good enough that a sequel would be welcome, for a change.
One of the coolest things about it is that Marvel seems to be creating a unified theory of Marvel movies--tying the movies together into a cohesive universe, much as they've done in the comics, instead of letting each movie universe exist independently of the others. Some, of course, they can leave in the box, as far as I'm concerned--Ghost Rider, anyone? Daredevil? But if they keep making them this well, and create a filmic continuity, that'll be a real accomplishment, and we'll be able to celebrate Marvel's decision to launch its own film wing instead of relying on outside studios.
Oh--and if you go, don't leave before the credits are completely finished, because you'll kick yourself if you do and then find out what you missed.