It was okay for a while then it just got old, the same jokes replayed or reinvented over and over. Same thing with the Simpsons it's the same thing over and over.

An adult cartoon that didn't last long that was good was God, the Devil, and Bob. The networks killed it because of what it portrayed as a somewhat cynical look at the interplay between God and the Devil using the human to do their bidding. I don't think it would have been as good if it ran more than the 10-13 shows that it had, because after that it would have fallen into the same fate as Futurama, and the Simpsons.