I like american dad. roger is hilarious. I hate king of the hill. I got burnt out on it back in high school when I used to go over to my boyfriend's house after school. We watched it every day before we fucked. then had dinner..
I don't agree that Family Guy is over-rated, though I do feel like it's lost it's steam a bit in later seasons. I think they've focused too much on the cut-away gags over the past couple seasons and, while they ARE funny, it can be tough to make a good episode with too many. As for American Dad or King of the Hill, I enjoy them both but I never really go out of my way to watch either.