I ran into Schaff & Co. coming out of Iron man. He was disappointed. I thought it was just about perfect. Not as good as Spider Man, but only because Spider Man was probably the best comic book ever produced. Iron Man was not that, but it was a very good basic superhero.
The movie is very faithful to the comic, weaving in a lot basic elements that made it very readable. In the comic, Tony Stark, millionaire industrialist, is injured in a racing accident. He designs a chest plate to repair his own heart, and then keeps adding options. Voila! Iron Man. The original iron suit was large, yellow and bulky; eventually the artists produced a much cooler, slimed down version. All that is in the movie, though the original story is changed a lot.
I was worried about rumors that the movies politics turns leftist in the second half. Not so. There are some pieties about the weapons industry, but the U.S. military is still the good guys, terrorists and criminals are the bad guys, and homeland security turns out to be alright. The character of Tony Stark is presented as someone who has a near death experience, and becomes a much better person. Much faster too, and he can fly.
If you like this sort of thing, you won't see much better.