Meh, I hated the Simpsons after an episode that aired maybe four years ago where it essentially stereotyped the Entire US Army, not just a few individuals, as a group of semi-retarded gun nuts. Not even Family Guy does that.
Anyway, as far as I'm concerned any good TV series has at most three good seasons in it, anything afterwards is just derivative, if not entertaining.
Edit: Primetime is 8-9 pm eastern, essentially. Let's see whose primetime is more interesting and in general good for humanity...
ABC: Super Nanny. What Would You Do? Extreme Makeover. Desperate Housewives. Skating with the Stars. Modern Family.
CBS: Big Bang Theory, Shit my Dad Says, CSI, The Mentalist, How I Met your Mother, NCIS
NBC: Community, 30 Rock, The Office, Minute to Win It, The Biggest Loser, Chase, Dateline
FOX: House, Lie to Me, Glee, Fringe, Bones, The Simpsons, Family Guy
Which would you rather watch? Fox is the best network right now for awesomely cool stuff, even if it sucks right now. Hate, but hate the other three more.