ABasically the Unrated version features several prolonged dialogue sequences that add up to a total difference of approximately 6 minutes. These extensions aren't that scandalous but for a fan of this movie this version is worth a look and features some more funny scenes. You can find a detailed comparison between both versions with pictures here.
ASuperbad attained mostly good reviews but did pick up some less than appreciative comments along the way. On Rotten Tomatoes it has a very solid 88% approval rating and a critical consensus indicating it's a vulgar teen flick, but with genuine heart and wit.Critics quotes:"Supergood." - Total Film, 2007"It's as if Mike Leigh decided to make a gross-out comedy." - BBCi film review, 2007"Doesn't quite have the insight of a classic, but it'll have you smirking for weeks." - Matt Bochenski, 2007"It's misogynistic, homophobic and only occasionally funny" - Phillip French, 2007"Easily one of the funniest movies of the year." - Gary Thompson, 2007"In spite of the film's startling deluge of dirty dialogue and sight gags, tender notes are struck." - Bangor Dailey News. 2007"It super freaking rocks" - Kyle Smith, 2007"Superbad is aptly named" - Mark Kermode, 2007"Superbad" is a four-letter raunch-a-rama with a heart, and an inordinate interest in other key organs." - Roger Ebert, 2007"And, while Superbad may not be "supergood," it's engaging enough to be worth paying full admission prices." - James Berardinelli, 2007"Its characters make no apologies for who they are. They just act out, and hilarity ensues" - Jeffrey Chen, 2007