Why the book is good: It is consistent in the messages that it tries to send, namely, that what pop culture is calling love is a sick glossed version of codependency, rape, self-abuse and deprecation. Sometimes it feels personal and anecdotal, but it still presents reasonable arguments. It's an easy read.
Now, why did it lost a star with me: I think she shouldn't turn a bind eye to the fact there are boys and men being abused by women, and that our culture also glorifies abuse when it's women on men as if it showed how the woman's supposed to be "sassy, a strong female character, assertive, outspoken", when, it's just abuse. In the end specifically there's an advice on how you should discuss with your daughters what they want on men, how to tell if they're abusive etc. The only times she mentions boys is how you should teach them to show their love properly, not be abusive etc.
It seems that still today we have this bad notion that only men are threats to their girlfriends, only they can be abusive, and we should focus on protecting our daughters. As if women were always good people.