How bad is the W nerf on Kha?

He's my main, after the Q nerf, evolving and maxing W was defn the way to go for me, made clearing jungle buffs so much easier and made ganks a LOT more effective. I didn't really have to use the W too much in ganks though it's usually a one time thing to get the slow so I can get on top of them and auto Q and keep auto-ing until Q is up again. The damage component of the W only really mattered for clearing camps and in team fights for the poke.

That being said I didn't get to play kha yet post nerf, for other kha mains do you think this made too big of a difference? Or the kha is still THE kha