How is Kayle OP?
When I play her, even if I play safe, get farmed, get to level 16, I still get dived and cc'd and bursted to death. You get forced to use your ult on yourself and they just wait you out and if you use it on a teammate, especially in Silver, they never take advantage of it or peel for you. She might be broke in organized and pro play but holy shit is she a gamble in solo que.