Yuumi is not horrible.
I have a 100% win rate on Yuumi and have soundly won every game iv played as her. She is a total blast to play and utterly dominates every lane Iv been in.
So why is her winrate so bad? Have I just gotten really lucky? Launch day I couldnt play support cause everyone else was playing her, now I get to pick her everygame cause no one wants her and I cant understand why cause she is so busted. Or atleast that is my perception of her.
I dont think she is as bad as everyone is saying, I think she is one of the most fun supports in the game now.