I read the their "terms of services" today, and, although I have an account, I am leaning towards not doing any business with them. Basically, they can take your account from you anytime they feel like it at their discretions, freeze your funds, etc... I have read other user terms, and none were anything "so against the user" like Poloniex. I agree with the OP. stay away if you can.
They even Trade with your coins and then block you from withdrawing them.Deposits do not show up when I needed it.
Happened to me with my PASC coins. They made a huge profit with my coins, now I can't access them.
That's Poloniex for you.
Ofcourse because it's just a little Altcoin with only 0.8% Volume of the exchange noone will say anything.
This is MtGox style fraud and it should be called out.