Who Is This "Superbad"?

"Come to me...'Superbad'. KNNEEEEELLL BEFORE ZOD!!!"

The trailer looked mediocre at best. As I watched it the first time I thought, 'straight to video...NEXT!'. So why is "Superbad" getting all these great reviews? My curiousity has peaked just a little. But I still think I'll be waiting for DVD and listening to much more word-of-mouth from people I know first.