Quinn sacrificed too much for her new "identity".

I don't like the Quinn rework. It feels like whoever did her redesign didn't spend much time playing with her. He didn't recognize that Quinn already had a strong identity; and in the process of trying to create a new identity, destroyed much of what made the old Quinn stand out. If you want a champion that can run around the map fast and then be totally useless once she gets there; just make a new champion already. If they wanted her to see competitive play, all she needed was an increase to her attack range. Linking it to her Harrier passive might have been a good place to look.

Her ult is now only good for re-positioning on the map. The fact that it has no cooldown is a fairly hollow trade-off, considering how well the new Essence Reaver itemizes for her kit. And they removed the mana cost? Again: Essence Reaver. See point C below.

 A: Her new ult is inferior for split pushing because of it's ramp up time and because she gets knocked out of it from any champion damage whatsoever.  One smite from the jungler and your goose is cooked.  There is absolutely no way you can drop your ult and go "Deuces!".  Her vault has always been an unreliable form of escape and has no guaranteed way of going over terrain.

B:  Shifting her execute power from her ult to her narrow skill shot reduces her ability to contribute in a team fight.  Quinn used to have significant strength in an AoE heavy team composition by contributing burst damage at the conclusion of the fight.  This was critical in giving Quinn a strong identity.

         a: Her ult is much less satisfying to use because it no longer has any oomph.  Her ability to chase and pick up stragglers is greatly
         reduced because of the two/three(?) second channel and how easy it is to interrupt/disrupt.

         b: It shifts her power from the end of the fight to nowhere during the fight.  Without her blind and Valor's dive, her ability to flank has become
         non-existent.   With the base damage reduced and shifted to an execute, her damage at the start of the fight is reduced.

         c: It's easily blocked by minions, walls, and tanks, which increases the enemy's ability to play around her point of strength.  Is this desirable in a short range ADC who lost her blind and has a wonky disengage?

         d: The complexity of her play decreases because you no longer have the option of different styles of engagement and diving close.  In group 
         fights, there is no critical moment where you shift from harrying from the edges of the fight to diving in for the execute.  By all indications from
         the rest of the patch, everything is intended to be dead by the end of a two/three(?) second channel. 

C: With 40% CDR and Rank 3, her ult was up whenever you needed it.  With CDR blues and Black Cleaver, that was easy to attain.  Now it's even easier.  If you died end game, it was literally up by the time you got out of the base.   I've watched enough LCS to know that if you are able to rotate safely through the enemy jungle to keep pressure on the lanes, you are going to win that game anyways.  The enemy's ability to knock you out of your ult actually increases the risk of taking said shortcuts in a situation where time is critical or the game may still be on the line.

D: It increases the risk of showing up to stop a split push.  Any strong split pushing champion isn't going to care if Quinn shows up to defend a turret.  If you look at all the mobility that the most popular champions get, Quinn isn't going to be able to do her job.. at least not by herself, which begs the question of how desirable she really would be for any team.  Vaulting away from an aggressive champion and hitting your Ult was the only way she could survive being dived.  No blind, unreliable escape, useless ult.

    a:  To compound this issue further, removing her blind from the skill shot gives her hardly any ability to duel in a 1v1 situation.  Combined with the     
    reduced damage on pretty much all of her abilities, she no longer has any ability to punish an enemy champion that is out of position.  I'm not sure
   if her current state is even sufficient to beat an ADC Teemo.

E: It really looks dumb.  Getting carried around by a bird like some fantasy reject version of The Rocketeer?  I mean, really? 

F: Removing the base damage on her passive in exchange for cooldown scaling feels like a side-grade at best, if not an outright nerf.   When you have
the ability to apply the extra damage "on demand" with her Vault, the higher burst damage seems far more critical to Quinn's identity and success.   
Target selection still ultimately feels pretty suspect. 

Whoever designed Quinn must have been overworked in light of all the other changes that marksmen have received, because every change made to Quinn feels like it was ultimately for the worse. This champion update was just smoke and mirrors. Shuffling around some numbers, adding some meaningless scaling, distracting us with a big "WOW, NO COOLDOWN!" in the right hand while taking away the blind, the damage and the versatility with the left hand. Ultimately, it feels like a pre-emptive nerf in light of some fairly Quinn friendly item changes, which is surprising considering how insanely buffed some of the more popular ADCs were.

I'd suggest scrapping the changes and starting over. There isn't much in the update with any real, substantive value. Even conceptually, the ideas fail to excite. If you took old Quinn vs. new Quinn, old Quinn would completely destroy new Quinn in all areas of the game.