Usually people just leave their negative responses and disappear.
That's true.
Most of negative feedback's are from "newbies" accounts, most of them are not interested in reputation of own profile/exchange/other service etc.
To be honest I also have bad experiences with Livecoin, slow deposits and another transaction got stucked again for me today, there is something rotted on their servers (already submitted ticket)... If there is alternative I'm always using the other EX.
Edit: Got it after ~5 hours.