Yasuo's windwall blocking things when it's behind you...
This is ridiculous and needs to stop. And yes, I mean behind you as in you are on the same side of it as him and you have your back to it. Or maybe even if your back isn't completely to it and you're close to it, but still, you're not facing it and on no planet is it between you and him. You throw out an ability, and it gets canceled like nothing happened.
Okay, I know Yasuo is Riot's own perfect Mary Sue and the game wouldn't be as interesting if he weren't as strong as he is and whatever, but come on does he really need a sphere of total invulnerability on top of everything else he has?