Some thoughts about Quinn (the thing about nerfs and lethality)
Quinn main here. I'm no Valor Bot. Just wanted to share my thoughts now that Quinn's showing up as a "secret OP."
So as you all know, Quinn's pretty strong as of 7.2, and she'll be even stronger in 7.3 with the Jayce nerfs. This is NOT related to her win rate. It's high, it's been high for a long time, and will stay high unless people start playing her for fun and not seriously maining her, like they do, say, Annie, Jayce, or Riven. She is, however, slightly OP right now. Not like Camille or LeBlanc or Syndra or Ryze or current Jayce, but OP. The thing that really pushed Jayce, Kha'Zix, and now Quinn over the edge was the buff to lethality. The buff made Talon and Zed a little more effective, and lethality be a little better on ADCs, but it's really too strong. (Someone I know played full lethality Illaoi and carried with it. That is a problem, no?) If Riot doesn't decide to nerf lethality ratios slightly, though, I guess I'm fine being a part of the new assassin meta. I do main a hybrid assassin after all.
Something else to clear up: A senior Rioter himself went on a rant after facing a Quinn in lane as Pantheon, saying that she's bullshit and needs nerfs. He (10/8/11) and Quinn (18/10/4) both did well, despite Panth being an absolutely hellish lane for Quinn. (From op.gg, it looks like Quinn was outfarmed in lane as she should be in this lane, but made up for it later.) First of all, the difference in KDAs is because Quinn carried her team (well, tried to), while almost everyone on the Rioter's team did well. Second of all, both he and Quinn built lethality (he got double, she got triple). Pantheon's another champ who abuses the stat: in terms of NA win rate, he's right on Quinn's tail - and has twice her play rate. Third of all, the Rioter won the game despite the reasonably fed Quinn. The objectionable thing, though, is that he'd like to pigeonhole her into being an ADC, and I'll just say it right now. That will not work. I'd go into detail, but I'll save that for if anybody wants to know exactly why. The long and short of it is that Quinn basically ends up with only one ability unless her support engages a lot.
TL;DR don't nerf champs because they use a newly broken stat, like people want for Quinn. Nerf the stat, then nerf the champs because they were flat-out OP to begin with, like Jayce after the buff to his ult, and Rengar and Kha'Zix after the assassin rework. Riot's fucked this up before by nerfing the champs, then nerfing/removing the stat or item they were balanced around (a la Devourer), making the champs useless. Don't do that to my beloved Quinn. Please.
Ninja edit 1 - not naming any names
being as it is currently.

should be considered a Marksman as well, but his Q is strong enough that he doesn't count I guess.
because of newly broken courage of the colossus, accept your fate birdy. Riot would rather keep the new things they make and nerf whoever abuses it rather than take that problematic thing out or nerf said problematic thing first.
first item on Quinn, as the AS was nice, the huge damage on E (or Q)+sheen+passive, and the phage passive was a great way to chase people down when you couldn't quite burst them. Is that not really a thing anymore?
before
teemo. almost forgot r>e>aa>q>aa>aa>aa>e = DEAD
Poke your enemy laner Early.