I like family guy. i will admit that some of the jokes get old, but it is a lot better than some of the other shows i've seen on adult swim (but then again, watching a dog take a dump or a car rust is funnier than most of the Adult Swim comedies.)
The worst thing about Family Guy is the crap little 'sketch' things that seem to appear several times an episode at the tiniest excuse, and be completely unrelated to the episode. A lot of them are too long, which is clearly just the writers trying to bulk up a weak storyline to the full episode time. Also barely any of them are funny, which is the worst sin of all in my opinion. And lots are making fun of celebrities that I, and probably everyone outside the US, have never heard of.