Haven't experienced any issues, and I play on Draenor/Silvermoon EU. I think that no matter how they go about it, some people are always going to have issues. Not always the same people neither.
Back in WOTLK I couldn't play my main for 3 weeks because whenever I logged on her, I'd get 3k MS and get booted. Could play on any other server without issue, but not that character on that server. Nobody else had my issues.