I am using Quora for over a 2 years now.I find it useful in 30% of the time as nowadays quality of the answers I am reading is poor and can not add value to our efforts.
Also, there are many people who wrote an answer without even having a knowledge on the topic which makes chaos to take decision as to what is right and what is wrong.As a user you will end up closing Quora without any desired information.
In last 6 months, I also find some of the fake account writing about the entertaining but non-productive stuffs which is not at all the purpose of Quora.I request Quora team to take necessary actions against them to maintain the dignity on this rich platform.I would not suggest quora as in-depth review was merely a 20% approx. and content was written like everybody is a professional writer.