On Hitbtc exchange, there are problem with 2fa which Isn't working several time due to poor security. I also experienced they taking long for kyc approval amd verify account. As well as fade up with their wallet maintenance issue most of the time. i have used many exchange but never ever experienced transaction fee as high as hitbtc ask. Hitbtc exchange suppose to be created for millionaires only.
I've never heard good feedback on this exchange. Fortunately, I haven't tried them and never used them at all.
This is one of the good reasons why someone has to check feedbacks and reviews first before using an exchange and it's beneficial doing it because you'll have the idea the issues of an exchange that you check, for example hitbtc as you have said.