Well... to be fair, the buyer experience is straight-forward. You make a deposit into an account, and depending on the seller's turn-around time (they have to confirm the deposit was made and from there WoC handles the rest) you can have your coins in moments. If for whatever reason you do make a deposit into some scammer's account and you can at least prove that you indeed made payment into the correct account, WoC can decide how to resolve and you have some sort of recourse. In my opinion this provides an excellent service for buyers.
However, as a SELLER, this market place is filled with fraud and low profit. I get multiple text messages of fraudulent deposits i.e. a text message received saying that a deposit was made when in fact no deposit was made. These texts often come during non-banking hours as late/early as 10pm/2am. Meanwhile, your coins go into a pending status and no longer available on the WoC market for trade. This is a problem and unfortunately is where most of your coins may end up: in cold storage and credited as pending.
This is combined with the number of fraudsters who now have account and other personal info. Not the end of the world, but perhaps explains the lack of traction/following.