This was a hard read because of the subject matter but the skill level of Tallent - Tallent's got talent! (sorry had to go there) - is quite evident in this book.
My Absolute Darling is a book peopled with archetypes rather than actual characters. This is plain to see in the dialogue. And the inner dialogue of Turtle. The characters are avatars playing the part of the oppressor, victim, the experienced, the naive, and so on.
Certainly, understand why many will balk at the sexual content that is used as the driving force of the story. This happens whether or not one wants to have to deal with it, either in real life or in a piece of entertainment. Facing ugly things is never pleasant. The power of this book are those tender moments that happen in the worst of circumstances even to the most hardened of characters like Turtle.
Disturbing? Hell yeah! But isn't that what the best of the arts accomplish by making us face the ugly? It makes the beautiful all the more so.