Ehh, I always found him talented when he wanted to be, he just didn't want to be often. Politics on Family Guy? Wasn't a big reason, why I quit watching (I think we've already mentioned the main reason why one would quit watching) but he got to a point where he got too heavy handed on politics and religion. Something I didn't mind because it was a show that was supposed to an insult everything show (though, it became decidedly one-sided as time went on).
I think I gave up on it, mainly because I just grew up, but I cant deny some of that other stuff didn't have a hand in it. (and with politics, I've gotten to a point I cant even talk about it anymore, which is why I've largely given up on the Politics thread. I'm utterly disgusted by everything with politics, and I don't see turn around on the horizon).
Note: In any case, I could name parts of Family Guy I really liked from the older shows. I also cant deny, after the return from cancellation those moments became rapidly non-existent for me.