We watch Community, but I didn't mention it because, while it is good, it's only "good" imho, rather than good enough for me to recommend to others.
I find that sometimes they go too far making humor out of poking fun at being offensive (especially with Chevy Chase's character, but also with regard to how they often make humor out of marginalizing admittedly exaggerated but still serious psychological issues that some of the characters have).
To be fair, I don't typically worry too much about pushing the envelope, but in most other circumstances where shows push envelopes, they are pushing the envelope in a positive direction, toward greater compassion, understanding, acceptance, etc. Community seems to push, exclusively, in the negative direction, toward fostering old, practically discarded, stereotypes, toward old, practically remedied, insensitivies. Bleh.
I also think Community relies a bit too much on meta-humor - humor about humor, in-jokes, humor that relies on understanding some unrelated context (such as some lesser-known Sci-Fi universes), etc.
However, having said all that, we still watch it, so go figure.