It's funny to see most hating Quinn. It was opposite for me.Well, she was created to be hated. People weren't supposed to like her. She was supposed to be the game's antagonist. Sometimes Devs have to change their plans. Just like Sage was supposed to be much more of a bitch than she ended up being (also, remember how she made fun of the MC if he said he was there to study and said only the nerds study?). Sage was the DIK affinity girl during the first episodes, now that's Quinn while Sage had become a Neutral girl.
I love Quinn. But I have hybristophilia and always tend to be attracted to the anti-hero/antagonist in games & movies. So I'm very very biased.
Quinn isn't very physically attractive, but something about her character is extremely attractive personality and story wise, especially when her tough girl facade shows cracks and you see glimpses of the real Quinn.
It'll be interesting to see where the dev takes her and MC. She's about the only main girl I like in this game (Rin is... just okay, I guess)