I know I'm late to the party but I finally watched Iron Man.
The story was predictable but Downey's performance was very good. Bridges was a little over the top for my tastes and Terrance Howard was completely miscast. He's an excellent actor but that role just wasn't right for him and I'm not surprised that he's been replaced by Don Cheadle in the sequel.
I really enjoyed the scene after the final credits, though considering that movie's been announced, it's probably not that surprising anymore.
My pet peeve though was the score. It outright sucked. There was no central theme, just stupid "Hans Zimmer-esque" background music. And the production was awful and phony sounding.
Furthermore, the "heavy" guitar that underscored a few of the battle scene was just utter crap. Not only was it NOT a cool riff or groove, it sounded like fake guitar (either sampled or a POD, ReValver, Amplitube, etc.). It certainly didn't sound like a Marshall, let alone a Diezel or Engl (which is what I think they were going for). I understand all too well that capturing a huge, thick guitar tone is difficult for most so if you're going to do it, hire a producer that produces that kind of music. They obviously didn't and it stuck out like a sore thumb.