I like gnolls but I don't think I've ever played one, and I don't recall anyone else I've played with playing one either. I made them potentially playable in my current setting. They're naturally occurring cynocephalics and not demon spawn. They're fierce hunters, and sure they might practice human-eating and perhaps even cannibalism, but they're not demon worshipping psychos. Well, except one splinter faction of them was, but the PCs put end to that and are now in good terms with the gnolls who were not so keen on the said demon worshippers taking over their tribe.