Many factor that indicates that this not good but recently many exchanges have this issue and must admit very slow response time.
Guess that time when we all got our fast response is long time gone.

is the withdrawal button in hitbtc already available? I have some amounts in hitbtc but due to the team already disabled the withdraw button and then i can't cash out my money from there.
But hitbtc gives the latest update about due to the network congested of ethereum and then all of the ethereum transaction become pending. But it looks true in my opinion. https://etherscan.io/txsPending

Currently cryptopia is having some problems with removing the coin from the floor, I also sent support and the manager of cryptopia announced it will fix soon. People should not be so worried, Cryptopia is a good commercial site, sometimes encountered some error is normal and acceptable. This is my opinion.

They actually have a pretty decent customer support. The only that kills me is their fee. 0.001 BTC fee for a 0.0005 withdrawal. Where's the justice in that?

They have great support and for surely are not a scam website guys come on. They probably have too many requests, withdrawals and everything else at once to handle it. I will concede that their fee is annoying sometimes going as high as 0.002 but I have seen worse and you should make it a point to not withdraw BTC until it is a small % of your withdrawal. Not a scam though they are probably understaffed if anything at the moment.

16 days ago I sent an #ETN deposit from my wallet to Cryptopia, and has not yet been credited. The same day I opened a support ticket, no response so far. I created a thread in the Cryptopia forum there are already 240 interactions with the same problem. Their only response was to say that it was the users fault, but my transaction was perfect and there is all the data in the blockchain. In my Twitter profile I am retweett users with the same problem. What to do? Wait a year?

wow...seriously? I just got registered there and was thinking of using them since they have a lot of coins.

Which one should I use if not cryptopia?   

Bittrex lets you register and deposit, then tells you that it requires identity verification using driving license scans, etc before you can withdraw. If you give it the driving license scans you most likely still can't withdraw because it can take months to manually process the scans if the automated system fails.

Poloniex is also switching to requiring identity verification using driving license scans, etc.

Bittrex closed a registration for a new users, there're not all coins at Poloniex, Binance also closed a registration. So, for many of new traders, there're no variants exept Cryptopia. And if the last one will not be working normal, there're nowhere to trade at all.