It was fantastic.
Couple things to note: It was absolutely vulgar. If you don't like frequent swearing and sexual references, this is NOT your movie. That said, the movie was absolutely hysterical.
I've read a review where they said that Superbad will be to this generation what Dazed and Confused was the the 90's and Fast Times at Ridgemont High was to the 80s, and if that's the case, that's some high praise.
Those who found 40 year old virgin, old school, etc funny, and dont' mind the "dirty" content getting kicked up a bit is exactly who this movie is for.
I've read that the older generations don't appreciate this movie quite as much, so that's something to consider.
Both the main kids do a fantastic job and it's a fun movie the entire time.
The story revolves around 1 friday night, a few weeks before graduation. There's a party goin' down and both the main characters feel this is the perfect time to get with their dream girl before the summer and college. They're left responsible for getting the alcohol for the party and the hilarity ensues.
chika-chika ye-ah.