A little more detail:
I still love The Simpsons. The Mike Scully years were very hit and miss (he gave us episodes like "The Principal and the Pauper", "When You Dish Upon a Star", and "Saddlesore Galactica"). While the show may not be hitting it out of the park all the time anymore, I still love watching the show and think most of the episodes are really good.
Family Guy is very hit and miss. I don't like when they preach too much (for example, I didn't like the episode where Brian got weed legalized), and Peter is just plain annoying (and not in a lovable way) and makes me hate any episode where he is the major focus. Ever since Fox brought back the show, they have made Meg more annoying (I really liked her in the original run of the show). Also, I HATE the Peter vs. Giant Chicken gag. I dread it when I see they are doing it because it's not funny and it's just tedious. FG is the worst of MacFarlane's 3 shows in my opinion. I still like the show, but not as much as I used too.
American Dad! went through a slump for awhile, but I love the show. I wonder if it was the smart move to have Haley and Jeff get married, but I will give it a shot (I thought the episode where he moved in was terrible though. Really, trying to justify smoking pot by saying that without it you are a chronic masturbator?).
The Cleveland Show was something I thought was stupid when it was announced, especially when it was revealed that Cleveland Jr. would go from being a hyperactive skinny 6 year old to a fat 14 year old. However, I have loved every single episode so far. Some of Cleveland's friends are really funny (especially Lester), I love one of the early episodes where Cleveland realized that some of his comments could be taken badly out of context (like when he was trying to help Junior make friends, so he asked a kid if he wanted to play with Cleveland Jr., and that Cleveland Jr. is short and fat but enjoys being played with).
Futurama is a show that should have been brought back instead of FG. It's funnier, the characters are more interesting, and it looks better. I was happy when they announced the four straight to DVD movies. I was also happy to hear it would be coming back to TV, although that was lowered a little when it was revealed that it would have a much lower budget due to being on Comedy Central rather than Fox.
King of the Hill started slow, it's hard to go back and watch season 1, but got better over time. It was funny to see what looked like a satire about how conservatives think, and how Hank was so in love with propane (so much so that Peggy and Bobby had to hide the fact that they though burgers cooked with charcoal tasted better than those cooked with propane). The visual style took a weird change in later seasons, it looked like they were being done by computers then. It wasn't worse, but it was different.
Sit Down, Shut up is weird. I hated it at first (and I wasn't the only one, it got canceled after a few months), but started liking it a little bit more when Fox started airing it Saturdays at midnight. I did like that it had several alumni from Arrested Development on it (Mitchell Hurwitz created both, and cast members Jason Bateman and Will Arnett).