I really don't get why there are so much bad reviews on Yobit ... I reviewed this exchange some time ago (
source FR) and it was pretty good. Simple to use, good security, and many coins to play with ! I didn't had trouble so i didn't get with tech support. For the old coins support it looks that it's pretty hard to maintain all the infrastructure. Look's like Cryptopia as the same problem as Yobit to maintain a very large amount of coins and tokens ...
Problem with Yobit is
not that they have technical issues - every exchange has technical issues sooner or later.
Problem with Yobit is that, if you encounter such technical problem, you have NO support at Yobit.
You can open support tickets - chances are they will not answer them.You mention Cryptopia: that's not at all the same approach! These guys from Cryptopia WILL answer back, even if it could take some time - but they always answer back.
Many people have coin stuck in limbo at Yobit. For months.