I have a lot of fun playing Yasuo, I think my record is around 50% win rate right now. I've had games I carried and games I've fed, but I feel like I play good more often then bad. The thing getting me right now is his win rate is 39%, the lowest in the league and the lowest I've ever seen for any champion ever. I also hate how players complain in champ select when he's picked, it happens every time. He is a hard champ to play, I don't think he is a bad champ, to me he reminds of me of Syndra when she was released.
If Yasuo was to get tweaked at all I would like to see something that allows him to get off his whirlwind more consistently. Right now his biggest heartache is having to 2x Q a minion or champion. Maybe if it worked like Riven where you could simply Q (and not be required to make contact with anything) to get to the 3rd Q it would help a ton. Without priming his 3rd Q he can be very defenseless at times.
I have gotten better with his W though and even without any changes I think he could become a sleeper OP champion, regardless of what the win rate currently displays. What bothers me most about the win rate, though, is he is sub-40% at all tiers, including Challenger.
Edit: After looking at his stats some more, he fluctuates from 45%-60% win rate at Ranked Team 5v5 Challenger, and his SoloQ Challenger stats went from 34% to 48% in the past 3 days.