It's one of the best shows (if not the best show) on television.
I've watched almost every episode. I missed the one last night (yesterday was my youngest's first birthday, plus we're preparing the house for market, so there's lots of painting that needs to be done, "artwork" that needs to be covered up, holes patched, etc.)
I don't remember watching an episode I didn't like - I even liked the one they did on the Bible. The recycling one was classic. I also liked the one they did where they went to an environmental rally (may have been the same episode) where they were getting people to sign a petition banning the use of "hydrous oxide".
I think it should be required watching. If it didn't come on so late at night, and if they didn't swear so ####ing much, I'd be parked there with my kids every week.