Experience that issue as well. and poloniex still consider themselves the best exchange for whatever reason a lot of traders do so.
That is why after withdrawing my funds, i never get to deposit there ever again and will never ever.
if we all guys do, let's see how quickly they'd add coins on their list.
In addition to the problems with withdrawals (heavily reminds me of my days at Cryptsy), I had also frequently experienced delays with receiving withdrawal confirmation emails. Once it took me about an hour to confirm my withdrawal, and I had to open a ticket at their support center. The support claimed that it was a problem with my email services. But they had been deliberately lying to me since from the email headers it was evident that the delay was at the exchange. I received this email a few moments after it had been sent by the Poloniex mail server. When I told them to check the email for themselves, they pretended that they didn't understand what I meant.