So there is a major problem with this hero’s design that no other hero shares to this degree: he is extremely binary in his outcomes.
I have the feeling that whenever I got a Kel into my group, they suck and rarely hit. Often enough, when I play against Kel though, they just rofl-stomp everyone with a single wombo-combo.
Playing against KT is not fun at all (in my opinion), as you either happen to have a bad Kel player (lucky you!) or you have the right tools / players against him - otherwise you are screwed, big time.
There are few other heroes or abilities on my personal list of “bad design” in HotS, but Kel’thuzad really is at the top of it. I hope they will someday rework him completely …
Until then, I will do the following and recommend everyone who feels the same as me to do this:
If you play draft mode and you see someone pick Kel’thuzad, leave the draft immediately to boycott this BS.