When did random humor become the only form of comedy? Hm.... I pretty much agree with Wandering's rankings, but I'd switch Old Family Guy and Futurama, as Futurama holds up better to multiple views and was more consistent through its run. But we've discussed this before, multiple times even I think.
Looking forward to Futurama's return, in the hope it doesn't suck. Better not be on Fox, though.