Agreed that Family Guy, American Dad, and South Park are funnier these days than The Simpsons. But all of those series owe their very existence to The Simpsons. If it weren't for Groening and the Fox network, the idea of prime-time animated cartoons oriented towards adult humor wouldn't have existed at all.

Personally I can't get enough Robot Chicken (Star Wars 2 was awesome), but that's a different animal. That one is edgy enough to be aneurysm-inducingly funny while sometimes making me want to erase my brain and forget I ever saw it.