Who is the most powerfull adc? This guy you say? 
WRONG, he doesn't even Smoke since he encounter:
This little son of a URF is the most OP think you will ever see in your pointless lifes.
You have to deal with TWO charecters at the same time, TWO, not even you Lee Sin can do that.
Her Q will blind you, even if she doesn't target you. AREA OF EFFECT in da Face, oh and if that wasn't bad enough, it BLINDS you scrathing your eyes, makeing your pussy champ Cry Blood.
But she have Low Range
Yeah, so she can see better your Teeth fly when she kicks your face and go back to shot you directly in your dirty dark Heart.
Oh, and she have a Sidekick watching every move you do. The summoner? NO It's a FUKING BIRD flying above you to eat your delicious bones when he kills you.
But the bird don't do that much damage (Q)
He can and will kill you, Quinn can Fly like Superman to let her Bird to Kick you ass. He have a 80% movement Speed, can have Vision of all he's surroudings and a gap closer if he sees you NO PLACE TO HIDE FROM THIS MAJESTIC HUNTER
HEY, put your pants on again, we aren't done yet.
You see, if you one of those 0 damage tanks that some how survive The bird, Just wait, Quinn have been preparing a RAIN OF ARROWS ONLY FOR YOU This ability deal more damage the Less HP you have, it can deal a total of 550 ad damage, OH WAIT, that's the MINIMAL damage. the max damage is OVER 900 And you though Kennen's Rain of lighting was bad.
Weak point? What? No CC you say? Quinn and Valor have the BEST CC in the game. Is named DEATH
What are you waiting for, sell that Weak adc you have and buy Quinn already.