Support - that's in fact the most common issue. exchange that takes the extra step to ensure deal with customers complaints no matter how good their exchange platform or system is.
Actually we consider an exchange as good, only if it has all qualities that we want. so good quality exchange wouldn’t have those issues, i believe. Yeah an exchange should take extra step especially so that they could verify customer easily and solve the problem.
I've experienced deposit not getting credited & frustrating is when there's no one from the exchange's customer support team handling your issue. i usually hesitate before using such exchange.
Notice that there are a lot of people out there who have problems with most of the exchangers but the problem is that sometimes they respond and sometimes they get annoying and misbehave and we present these problems and solutions. They don't try to do it, they just mention it here and there to talk, although I think it's better to have no one to respond to.