I don't like the idea that permeates the book, that "abuse is something good", "gaslight is kinda cute", "women are happier when they have a knight to save them from that bad bad men" and that you'll never really escape abusives relationships.
We see Marianne strides from one man that humiliates her, to other who hurts her feelings or even hurts her, sometimes going back to the same man or the same way of hurting. You would think that she was going to finally understand that she likes this, what would be a good and unique plot. But no, at the end when she finally asks the things she like on the bed, she is treated as repulsive and gaslighted to the point that she accepts the humiliation on the bed, the way her partner wants and that she doesn't particularly likes.
Marianne starts the book as a independent girl who takes action and ends as an woman without any control of her life, to the point that The Knight™ decides if she goes to a party or don't. Again, if the story was about that it would be great.
Conversations between friends is the second book I most love. Normal People doesn't come any closer, it made me sick of the stomach.