I don't think my butthole can take much more.
EDIT: In case people want actual discussion here...
His early damage is too high. I understand he's reliant on snowballing, but he shouldn't be chunking 1/3 of a botlaner's HP with a level 2-3 Q. It's much too spammable to have such high, reliable damage. Not to mention his in-combat stealth and resetting, damaging gapclose/reposition.
Lower his damage so he can ACTUALLY be shut down. Kha'Zix always comes back as soon as he gets even a little AD, because he can oneshot from behind.