I tried to watch Casablanca, but it was all black and whitey, even half way through, so I stopped watching. Casablanca therefore sucks.
Seriously though, family guy is pretty damn funny once you know the characters, and it really is hard to explain what can hook you. For me it was something stewie said as a tiny offhand comment, and it just caught me so offguard that THEN I was hooked.
Of course, I do suppose that my quality of life doesn't change any if you don't like family guy...more tv bandwidth for me! whoo hoo!