Cryptopia is legit, I have used them a few times to buy coins that are not listed in the exchanges that I usually use. And Except for their slow support and the high withdrawal fees (.002
BTC) I have no complaints.
If you want a detailed review, I suggest doing a simple google search. It will just pop-up
Figured you might want this so here you go, It's their ANN thread here:
Cryptopia Cryptocurrency Platform Services and Development