Jeff Winger is the glue without which the show falls apart.
However, Troy and Abed take the show from very good to amazing. They put the show over the top.
This is a great show to start off NBC's Thursday night lineup. BTW I hope you don't change channels before 30 Rock comes on. It's basically a show about how they make Saturday Night Live, although the names are changed around some. Extremely funny. I'd dare say it's even a tad funnier than Community.
I think NBC is trying to rebuild its Must-See TV lineup.