south park has classic humour, which we'd definately not say in real life, but they get away with it coz its funny, family guy is trying to dish every1 in a satircal way thru flashbacks which leads to another flash back and so theres no real point to their story and peter griffen is the kind of guy who if u met in real life would wanna king hit which makes it so funny, simpsons, started all this, so it has alot of credibility, havent seen many new eps, but old ones (usually get repeated alot on 10) are really funny and u can watch over and over again.