These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base The fandom's reaction to Kate Brian's decision to add magic and witchcraft to what had been a reasonably realistic series. Some find it to be an interesting twist to the plot while others consider it an Ass Pull.
Ensemble Dark Horse: Noelle is one of the most popular characters with Private readers. Even some of her more cruel actions have not dampened this, see below.
The fact that Ariana is currently starring in her own spin-off series of novels should tell you something.
Noelle and Reed. Reed goes out of her way to impress and be close to Noelle; quite frequently other characters comment on Reed's utter devotion to Noelle. She feels empty without Noelle and explains that they "need" each other. Noelle has an obvious soft spot for Reed. Reed is even tested by Noelle's grandmother to see if she truly cares about Noelle more than anyone and anything in the world. (She passes with flying colors, of course.) Subverted near the end of the series with the reveal that Reed and Noelle are half-sisters. Unless you're into that.
Reed and Ariana. Later turns into Foe Yay after Ariana is revealed to have murdered Thomas.
Ariana and Kaitlyn in the spin-off, Privilege. Ariana fantasizes about helping Kaitlyn escape and the two of them running off to Australia to live in a house together for a happily ever after.
Leanne and Natasha: who turn out to be actual lesbian lovers
Mary Sue: How some readers feel about Reed Brennan. After the events of the most recent Private novel; Ominous, this seems even more true.