Quinn needs to be reworked!
So I just saw the
nerfs to her E on the PBE, and I can understand why Riot would want the ability to be used less frequently in lane. It offers a fairly low-interaction lane for her and a melee enemy, often leading to favorable matchups on Quinn's side.
However, it might also be problematic for the champion to place the ability on such a high cooldown + mana cost. If for whatever reason, she uses her Vault, and the enemy uses a dash ability or flash to get within range of her, she'll be slaughtered. Forcing a fairly squishy ranged laner to interact more with melee bruisers/tanks will easily make her a liability for her team, which will result in a nearly nonexistent playrate.
Instead of nerfing her laning phase, do something about her ultimate, as it is the source of frustration among most of the League community.
She could be made to go into the bottom lane, but her kit as it is now does not allow for it to be done successfully. Therefore, she will need a rework.