I occasionally still watch it, not because it's one of those shows (You know, the kind which you think "Maybe I'll watch it because I'm so bored" and you end up channel surfing while doing it) and I'm a big fan of the show. Frankly I don't think it's become worse I just see it as evolved. Since it's days as shorts on the Tracy Ullman show to the mega culture it is now the show has constantly been changing, be it in the themes, the humour, the animation. Just compare Homers night out (My least favourite episode)to the mansion family (My favourite episode) and you see a dramatic change in theme, seriousness, animation and humour. With something that's been around as long as The Simpsons it's natural that the producers will want to take it in a different direction.