It's interesting that the most complex and human love interest in the game is so divisive. Quinn comes from the most broken home with the least wealth, no family upon whom she can depend, no real friends, and a survival instinct she learned from her surroundings. Growing up in an environment where people have to have their fix at any cost or sell to people who have to have their fix at any cost teaches a person that being like the Jill's or even the Sage's of the world gets you hurt.
Quinn doesn't even know what real love is because she's never experienced it. Her entire life has been about what people can get from her and never about what anyone can do for her without a quid pro quo expectation of something in return. The MC could be her first true love interest in terms of someone who is not using her for anything and who genuinely likes her for the good qualities he knows she has behind the offensive sword and defensive shields she creates to keep people at a distance.
People don't come without baggage. Just because Quinn's baggage is more ostensible doesn't mean she is more flawed. Quinn's story has been told to a greater extent than has the story of other love interests. Perhaps when their stories are told they will be equally flawed in other ways. It might be best to reserve judgment on characters until the story has been told in its entirety.
Well said bro. You can see everything you're saying is true just by looking at the rain scene; at first, Quinn is suspicious and confused as to why the MC would help her, and when he offers her money so she won't get hurt again, she thinks he wants something in return because that's her world. In her world, where you grow up with junkies for parents, where you're abused and called a rat by the people around you, everyone always has an angle, they're always trying to get theirs. So for her, the MC wanting to help was confusing, that's why she gets angry, calls him stupid for wanting nothing in return, and then has sex with him. In my opinion, that sex was her trying to reassert her quid pro quo worldview on the situation, forcing a give and take on the MC with her body so she doesn't have to owe him and become vulnerable. Afterwards, he asks if she's okay, and she hushes him with a finger and tries to leave. But when she does, she turns back one last time and asks him not to tell anyone that she was there or what he saw, and he agrees without hesitation.
She looks away, pauses for a moment, looks back - she knows he's genuine, but she doesn't know how to respond. She leaves.
You can see this happening again in the hangout with Quinn. She's uncomfortable with kissing because it's intimate, but she's more than happy to offer a blowjob to the MC - sex to her is transactional, impersonal, a way to pay someone back or get something you want. That hints at the kind of world and mindset Quinn comes from. I think, just like Sage, when the MC starts saying 'no' to Quinn's advances because he wants something more from her, she won't know what the fuck to do. She really doesn't know how to be normal.