Choose between mitigation and damage ..
Looking at DK in general and Frost specifically, I don't get why they would force a choice between fixing a huge problem today -ability to survive- and damage .. Not only do they remove one of the most fun PvP abilities EVER in WoW 'Decomposing Aura' but they make the DK choose between Necrotic Aura (+8% Magic Damage) and one of the new x2 'survive' PvP talents. If that is not enough, they added a 50% snare to the DK when using it ..
So 15% less HP on target + 8% magic damage BOTH need to go just to get enough mitigation to kinda make it in PvP ..
The fix was simple and it was reduce Death Strike cost and increase its heal .. That is all they needed to do ..
Fix one thing and break x2 ..