My experience with Quora has been pretty bad, but that has mostly to do with my topic selection and network being Indian.

Quora got popular in India because of widespread adoption in IIT circles, who by virtue of being influencers spread it across India. So much so that, I saw a statistic which said that most visits on Quora are from India.

However for me what that has meant is that a rash of new registrants have appeared who have destroyed any topic related to my alma mater and India.

EDIT - Also shouldn't this 'Indian Invasion' have had an effect on the valuation?

EDIT - I am also an Indian and mean no disrespect. But the fact is that one of the side effects of Quora getting popular so fast is that it is often the first Internet forum for many students. I know it because I have talked to them. And that ends up in usual newbie mistakes.