There are a number of people on Quora who post very high quality answers. There area a lot of people who post very entertaining but not necessarily authoritative answers. And then there's tons and tons of junk.

And while the good answers seem to get upvoted a lot (the ones I see at least, but that's an obvious case of selection bias if there ever was one), but plenty of terrible or even wrong answers seem to get upvoted a lot too.