On Kha'zix... rrrrrage...
I dont know at other elos, but im silver 1 and I wanted to discuss the fact that this champion is particularly broken imho. I mean he does exaggerately high damage to isolated targets and gets so fed every game I see him. Either the range of isolated targets could be nerfed, or the amount of bonus damage he does, or the resets, but I feel his kit is broken. Am I the only one having this opinion? Are there ways to plays against him I don't know yet about? 
in the respect that you should not be moving around the map by yourself once they have ult. Stick together as a team, and if Kha/Rengo jumps you, hard cc them, and burst them down. They should not be a problem then.