As was the case with this season of Always Sunny, South Park's 10th season was incredible. That season had the Warcraft episode, the Family Guy & Mohammed 2-parter, Richard Dawkins banging Mr/Mrs Garrison, and
niiiiiiiiice.
To be fair, there were also a few duds in that season. Though it doesn't seem to get a lot of love, I also really liked the Towelie+Oprah episode.