Rengar has one of the lowest win % chances according to Lolking, I agree on the Singed/Jax/Kata nerfs though, Kata is just too strong having that full reset on her basic abilities every time she kills something. Jax is just too damn good at steamrolling when he gets going, free armor and mr from building offensive, it's like the opposite of Ryze/Galio. Singed is just borderline annoying seriously.