Yasuo's E-Q
I find this to be the most frustrating part of his entire kit. Without E before his Q Yasuo at least has to aim his Q's and you can juke him a bit even though the cast time is essentially instant. But when Yasuo gets his third Q tornado, and then just E's through a minion wave and then to you and knocks you up, essentially destroying you without a chance to even try to dodge it it's just infuriating. Last game I played, BOTH our teams had really just awful Yasuos who had no mechanical skill whatsoever. I mean, I killed their Yasuo without him actually touching me as Master Yi through juking his Q's and going untargetable when he tried to E-Q tornado me. Then I see our Yasuo, who actually LOST to that Yasuo in lane, pretty much solo win us a teamfight with JUST E-Qs at 200 hp staying alive off the flow shields he got from his E. He never landed a Q that entire fight besides his E-Qs. I actually would like facing Yasuo if it became a contest to see if I can juke him out and cause him to miss his Q's. This never happens because he doesn't even have to aim his Q's most of the time since he has his awful E-Q mechanic.
Never actually defined what I meant by E-Q so for those who don't know what I'm referring to, it's when Yasuo dashes and mid dash activates his Q so when he arrives at the dashed target he casts his Q in a circle.