Oh my gosh. This episode proves what many of South Parks' detractor's thought impossible. South Park's got Heart. The episode starts with the words, "And now a very special episode of South Park". I thought they might parody the very special episode to pieces, but this really is a serious episode. There are a few jokes here and there but mostly it's just really sad. The social commentary isn't hard to see. But I found Cartman's own lack of conscience at the end unbearable. If it wouldn't have had that last "joke" the episode would have been absolutely perfect.
In the end, this really is a very special episode of south park.