A very interesting question. Tommy and Quinn are both at the top of my favorite male and female characters lists respectively, so my opinion stems from that - or leads to it, depending how you look at it
Quinn's attitude is the least damnable of what you outlined imo, hardly a fault at all if we're being holistic about her character. She presents a brash and unperturbed exterior but has a vulnerable side kept locked underneath. As to not being very ladylike in behavior, I happen to dig her vibe and banter
Her crazy antics with MC, Maya et al can border on sadistic but they are also an expression of caring - she has basically no reason to mess with MC beyond the panty-stealing challenge in Ep 1 yet she chooses to instigate shit with him all the time because it brings her genuine pleasure and fun. With Maya this takes the form of
Mean Girls style hazing, time will tell whether she chooses to actually exploit her authority over Maya in a truly reprehensible way.
Her prostitution ring is, at the moment, entirely voluntary as all the girls involved are ok doing it. Mona backing out is a sign that she
can - hence I hardly see it as something worth redemption for now. We see both Quinn and Tommy take drugs up the veins in a flashback. This means that she does not simply deal in regular weed as she claimed to the preps and that she is involved in some pretty shady underworld people, which personally is the only thing that worries me about her drug use or her in general.
As for Tommy, he is the asshole authority figure for MC and similar to Quinn I love him as a character because he is great in that role. He has strengths and glaring weaknesses which mean he has enormous room for future growth and as such he can evolve into an ally, an opponent or both during the course of the story. He is not one dimensional by a long shot, his ubber territorial cunt sergeant personality exhibits a tribal and loyal aspect to Tommy - family comes first, there's a reason he and Rusty founded the DIKs with that motto - and he has shown on numerous occasions that he is not above acknowledging MC for doing something he approves and even admires. His meltdown in Ep 5 was a result of his short temper and getting his party and trust shit on by Quinn and the hots, getting humiliated by the alphas, and the DIK mansion getting ransacked all in the same evening. Then he learns they can't rely on their old lifestyle anymore - childish yes, but not surprising that he'd be furious.
If you are familiar with the Netflix show
Elite, then Tommy resembles the character Guzman almost to a T - Guzman for much the same reasons and more is my favorite character on that show by far as well