So word on the street is that Blizzard tried to implement some sort of lockstep mode and failed miserably at it.
When you send attack packets, the server will rubberband you into a different position and will ignore your attacks.
Frenzy barbs have always been my go-to char for "play and chill", so its been a not-so-chill ladder.
(WW is worse by the way and completely useless, not even worth building)