I used to be a fan of The Simpsons all my life. I grew up watching it, and could even quote some passages from it. Once I began to grow up, and things began to change, I found myself watching it less and less. I guess that it is because of the repetition of ideas, and the staleness of the jokes.
Family Guy is the show that I watch now. It's not a laugh riot for me. Still, there is something about the flashbacks that they have, to show a joke, that I enjoy the most. There are times when I find myself laughing at it at a random joke that they just threw in there. Of course, the problem with Family Guy that I am having is that people at my work keep quoting it constantly, and the jokes just get old.
King of the Hill is another show that I watch if there is nothing good on. The problem with this show that I have is the fact that it's too realistic for my taste for cartoons. Sure, it is nice to see some realism in there, but still.
American Dad was just plan not funny. I laughed at some jokes on King of the Hill, but American Dad was just...meh. It tried too hard.
And I found Beevis and Butthead to be too much of an insult to my intelligence.
South Park and Futurama are my favorites. They always get me to laugh. And heck, Futurama was just great.