Actually, as a conservative, I believe there are standards beyond like/dislike. Character development may or may not be found in a book, and finding it is good. Dialog can be realistic or not. The former is good. If the protagonist spends her time obsessing over a boy, and that is accepted as love, then the book is bad.
It is like when a movie substitutes sex for love, or action for suspense - it may make it popular, but it doesn’t make it good.
and, as a conservative, if you are raising your children properly to know what is good and what is bad, watching a movie or reading a book is not going to disrupt their sense of right and wrong. i believe in reading. period. i have three fully grown [well, the youngest is 15, almost fully grown] morally intact, spiritually secure conservative children. i don’t fear books or movies.