I think this has been a lousy season, actually. Not only have the jokes been bad, but the show used to seem to revel in bottom of the barrel TV. It was ABOUT finding and making fun of crappy TV shows. Now it's mostly celebrity walk-ons and clips from the same shows over and over (although, I can never get enough Greg Kelly!). I wouldn't watch it anymore if my fiance didn't regularly DVR it, and even she's close to giving up.
And as an aside, is McHale's horrible taste in clothes a parody or is he for real with some of those shiny jackets? Dude, you're 40. That stuff looks douchey on a 25 year old, never mind a 40 yo.