I don't see Tommy in a different light, he started as an asshole and continues to be an asshole. Same with Quinn. Just because they are more three dimensional doesn't make them now "better" people.
In your opinion she has a softer side, just because she fucked you on the roof and kept you from falling doesn't make her Florence Nightingale.
We need to see what happens in ep 5 before we can really know if Quinn has an actual softer side or if she is really a main antagonist. I don't like pimps and drug dealers so I don't see any reason to look for a "softer side" in Quinn.
And I am more than willing to agree to disagree. We shall see which of us is wrong in ep 5, maybe we both are and she turns out to be an alien sent to anal probe as many college students as possible.