In case you hadn't noticed, Iron Man is making a serious run at being the superhero movie of the year. Even Batman might be sweating a little. The Hulk is definitely a deeper shade of green.
Excerpt from a good review:
Perhaps the best thing about Iron Man is its show-stopping sequences of special effects. It’s almost passé to applaud special effects in blockbuster films anymore, but it is certainly appropriate here. The Jetsons-esque robots and gadgets and inventive weaponry displayed in the film make Transformers look cartoonish by comparison.
Of course Iron Man will never replace Spiderman as the greatest superhero of all time, but he's doing the best he can with what he's got--a cocky-but-improving alter ego and a lot of shiny robotics.