Honestly, he's like the squishiest melee ADC I've ever played and it's a pain in the ass to survive the early game let alone midgame. No matter how fed I get early game, I still feed hardcore in teamfights and small-scale skirmishes. It seems to me that the more fed you get, the more times you will die because the enemy team will just CC you and burst you down in 2 seconds. I just don't find him rewarding to play at all.
I find I have to build at least one defensive item with health after static shiv on ARAM. Personally I go with 
He is still really strong at that point. I am not really the most skilled with him though. You can build all damage but like you said one snare or stun and you are dead.
step 1. run away
step 2. if they chase you, you turn around and whip out your dick tornado
step 3. R2win pentakill
You have to build a little bit of defense on yasuo, since his ulti essentially throws him into the middle of the enemy team.
1 vs 5 can be done against unaware opponents that fall in eachone of your mechanics (That happens for a lot of champions, duh).
Anyway you are getting all the hate of other players by playing Yasuo so you get all the focus and get countered hard. Ppl still fail to realize that Yasuo has his own problems like any other melee carry.
