What I struggled with was not being attached to the characters. As a character, Marc was cold and distant. As the reader though, I want to find reason to root for him and I didn't find one. Although things about his past are revealed, I still felt disconnected. Similarly, I felt the same way for Sophia.
I did not find it to be anything like FSOG, Bared to You, or The Siren. It is still very much a book worth reading though.