Playing KT now is pretty un-fun with Tracer in the game, especially in disorganised QM. Which I guess is only fair considering how un-fun it's been to play against KT for so long.
Part of the problem with supports and their design in HotS is the lack of items. If Medivh were a Dota support, you would get an item like Mekanism to supplement his lack of healing, but that isn't a possibility in HotS. They're left with just designing every support to be a healer to some degree, through direct abilities or talent selection, or classifying them as a specialist or tank. I mean ETC is kind of the Tidehunter of HotS with his AoE stun.
I actually don't find tracer that bad with KT. She's an absolute pain, but Illidan is far worse I find, and at least KT has living bomb to throw on her. As Jaina, Chromie or Li-Ming I always feel utterly useless against tracer...