I'll cut to the chase right now. SUPERBAD is better than KNOCKED UP. The thing that bothered me about KU, yet seemed to be one of the positives for everyone else was that it got "too real" and "too preachy" by the end. All this growing up and maturing bullshit felt too chick flick for me. Apatow films (40 year old virgin and KU) seem to hit this wall about 3/4ths in where they stop being funny and start to get real.
Thankfully, SUPERBAD doesn't fall into the same trap. It is the great return of the American sex comedy. Now, I know American Pie used to be that, but that franchise is so run into the ground now that it has lost any luster it may have had when it initially came out. A ton of pretenders later and the teen sex comedy really needed another lift (erection joke!), and SUPERBAD is the Viagra.
There are some amazing set pieces and the entire movie's age old plot about high school kids getting booze/sex is carried out in two very entertaining and eventually intertwining ways. Evan and Seth (played brilliantly by Michael Cera and Jonah Hill) have the more grounded adventure leading them through some wild situations...but Christopher Mintz-Plasse (you need a hollywood name now dude), who played the instant movie icon Fogell aka McLOVIN was the real discovery. His wild escapade with the two loser cops (Seth Rogen and Bill Hader) trying to relive their youths through McLOVIN was amazing to watch and led to some of the movie's most memorable scenes.
Overall, this movie maintains the level of quality all the Apatow family films have had. It is amazingly quotable, hilarious, has heart, but unlike the other Apatow films it doesn't smack you over the head with the emotional message. I can't recommend this movie enough. Go watch it this weekend with your best friend before you head off to Dartmouth for college.