in every way. On MY team? Well I'm scrub silver and so are my teammates. Yasuo is a difficult champion to play. So more likely than not, he's gonna feed. If he gets lucky and doesn't, he's gonna be an arrogant, toxic jerk because Yas players always seem to feel like the entire game revolves around them and they're the only important person on the team. They get cocky and rush off alone because "fed hypercarry yo" and then they die alone. No teamwork. He'll dive in 1v3 and call worth if he gets a kill, even if he dies, giving up a shutdown kill, three assists and the two objectives the enemy gets in the following 4v5. Yas players tend to think being 11/10/2 is an acceptable score, and will gripe at the 0/6/18 support for "feeding".
On the enemy team? Yasuo is so obnoxious to play against that even if he's bad, you're going to have a frustrating game. Enemy Yasuo is an arrogant prat too, and he'll tell you by spamming his mastery icon or just acting dickish in /all chat. If he does anything well expect him to gloat and take credit for the "carry". If he does poorly he'll rage at his team and yours, calling you no skill if you're a simpler champion than Yas (and to him, EVERYONE is) or just calling you bad and trash if he can't muster the brainpower to give an actual excuse. Despite this if he can manage to slap R after a good initiation he can win a vital teamfight for his team despite being 0/9 and having the CS only 12 better than that of the support. Accidentally using his wind wall well can also win a teamfight for his team by screwing over your adc. And god forbid you run into the 3 or 4 man premade that runs a "yasuo comp". Three guys that all build to feed, baby, camp and support one of their own who picked Yasuo. Even if they're bad it will insanely obnoxious to deal with and if the poor chump laning against Yas can't deal with the constant 3 man dives and ganks, the smug hyper-douche will get fed and fed yasuo is terrifying, even if he's crap.
TL: DR: Delete Yasuo.