Need info on Iron Man (no spoilers, please)

[FourFifty]

A friend of mine is thinking about taking her three year old kid to Iron Man. She asked me (the biggest geek she knows) about it, and I had nothing but I told her I'd ask other people who have seen it.
Would you take a three year old kid to see Iron Man? Too much action? How much useage of various 4 letter words, etc etc. If someone can give me a quick rundown to see if it's family friendly that'd be awesome.