It is the lack of listed coins: even independent currencies, like Monero or Litecoin isn’t there! This is the sole reason I personally cannot migrate from centralized exchanges to Bitshares.

Honestly, adding a new coin should be as easy as creating new wallet, or, at least, it should be accessible to anyone, thus eliminating centralized nature of someone in dev team deciding what will be trading and what not. This way the BTS will rock! Otherwise - I am not sure what devs are trying to accomplish.