I've been watching the first season of Community, and I was a little unsure what all the fuss was about. It's a very funny sitcom, and certainly better than a lot of stuff on TV at the minute, but given all of the hype I was expecting a little bit more.
That all changed about halfway through the run, when it suddenly hit it's groove and became one of the sharpest, funniest parodies about films around. Episode 21 (Contemporary American Poultry) is one of the smartest mobster skits I've ever seen. If you are interested in the show, I'd recommend starting with that episode so that you can see how good it gets.