Yea and now lets look at those realisticly, in a setting where junglers aren't braindead:
Top: Free feed, Quinn, Free feed, Free feed.
Mid: Corki, Potential free feed, free feed, Quinn, free feed, free feed.
Jg: Graves, free feed, Quinn, free feed.
Support: Mf.
Look at how that worked out pretty well.
The problem of having a marksman in another lane is that mages are far stronger in the early game, and mostly have a higher range for poking.
Due to jungle presence on top of that, and marksman being unable to dish out enough damage that early into the game to either go for a 1:1; and with being squishy, mages can either zone them, or at the mere second AD goes for a CS, he gets ganked and gives up that free kill cause he's squishy & mostly has no CC/escape tools (ezreal is the exception).
Quinn is NOT an ADC also.
She is more of a "rengar" type of champion, then Ezreal/jinx/vayne/etc.
She roams the map with her ult, until a squishy gets into her sight, and she kills or ends up killed as simple as that.
Currently, adc's are in an insanely bad spot due to everyone scalling insanely, and them either dealing damage, or opting for a 3rd def item and dealing literaly no damage (unless they get fed).
And botlane is a fiesta of it's own at the very moment, since if you don't get 5manned on botlane by 7th minute, you're either in low elo, or enemies have an autofilled jungle+top.