I saw Iron Man the other day. And yes I am a big fan of comics and comic based movies, but I've never been a big fan of Iron Man. I don't hate the guy, I've just never really had any interest in him. The movie, though changed that, somewhat.
First off, it's a well-done fun movie. As is popular now, and for good reason, the movie focuses on the man behind the mask. This was a great way to take the movie, but that's where all the interesting parts are. Yes, I go to see explosions and special effects, but lets face it, most of them are shown on the preview so by the time I see it in the theaters, I've already seen the effect 8 times. Robert Downey Jr is superb in his fleshing out of Tony Stark, Jeff Bridges plays up the villain to almost-over-the-top perfection, and for the most part Gwyneth Paltrow displays Pepper Pots, the love interest, as a strong independent woman (at the end, for some reason, her character deteriorates into a dumb blond). Obviously I would recommend it. And for those comic book fans out there, be sure to stick around after the credits for an amazing surprise.
Bit of trivia for ya': I believe this is the first movie fully funded by Marvel's movie department, which might explain that care that went into it.