It's unacceptable that you even dare to mention Cryptopia as an option for people to make use of. If you do a few minutes worth of browsing through some threads here, and on social media, you'll see how many people aren't able to withdraw anything, and this has been going on for months now. On top of that, Poloniex has been taken over by Circle, which is backed by wall street banks. The deal was even approved by the SEC, and that alone gives Poloniex far more credibility than 95% of the current exchanges. The only exchange service you stated that is worthwhile and not messing up, is ShapeShift. The rest is either shady or very questionable....
I knew Poloniex was horrible with unacceptable customers supports, but as being acquired by Circle we can imagine a serious spring cleaning is coming soon. As for Cryptopia, I don't know exactly are the problem but I am able to use it without any problem (deposit, trade, withdraw)