Yasuos 53.8% NA Iron and up win rate...
And a 63% ban rate.
With such a high ban rate we can safely assume that when he's open he's locked in and not necessarily by someone who mains him either. IE someone who isn't playing to his best.
Seems a bit extreme to me then his win rates are so high for such a low pick rate champ.
So in a nutshell Yasuo is stomping low Elo and basically the majority of LOLs playerbase then.
And call my a cynic I doubt these nerfs next patch will be much more than a placebo nerf for PR purposes.