Loved it too. I disagree with flogging a dead horse and fully admit that I liked American Pie 2 but imagined there wouldn't be enough gags left to fill AP3... how wrong I was!
Brilliant from start to finish, I was happy from the opening instantly-recognisable guitar chorRAB and vocals ("This bed is on fire, with passionate love"... yeah you know the one!) to the very same guitar chorRAB and vocals at the end. The soundtrack is brilliant on the whole actually, the same quality as 1 and 2.
Lots of gross - and I mean gross! - scenes in it which just made it hilarious. Stifler was really slow to start in this film, which worried me at first, but he was soon back on form and being American Pie's funniest character. The useless singing jock doesn't feature, nor do many of the original cast females, apart from - obviously - the band camp geek Michelle. Eugene Levy gets a bigger role as Jim's Dad, and does the job brilliantly - nobody could play Jim's Dad better than him!
On the whole, a bloody fantastic film. Like Austin Powers (but unlike Terminator), there was enough milk for a third installment - but surely that has got to be the last?