When this show was on TV I didn't "get it" because I caught it on in the middle of the episode, in the middle of the series.
I watched the first episode on the net, then the first season. Now, I bought the entire series.
The best thing about the show is the cast, each play their role so well. The jokes are always solid, and it never dumbs down its humor for mass market appeal. One of my favorties right now.