Nerf to Katarina E
Although I think Kat was a little to strong before, I think that nerfing her E cooldown was a terrible idea. Her E is the main part of her kit, and nerfing that was detrimental to the champion. Early game now it is impossible to not get outtraded when you go in with your combo. Instead of nerfing her shunpo, you should have nerfed her damage a little. That would have lessened her strengths and wouldn't have annihilated her early game.
PS- you nerfed LeBlanc's dash cooldown and that made her complete garbage. I wonder what nerfing Kat's shunpo cooldown is gonna do.
I think she needed a little more time early but they added too much. and it went from risk early game to a very high risk early game. The whole point is to either get ahead or struggle the rest of the game.. Now its just so much harder to really get ahead.