I saw this review in my head very clearly when I finished the book, but that was 2 weeks ago. 
 McEwan's writing is incredibly captivating and mesmerising. I could not stop reading the book despite how uncomfortable it was making me feel. Because it made me feel uncomfortable. 
 For those who don't know, the book revolves around an incident that takes place at the beginning of the book. There is a terrible accident that links people who had never met before, and makes other go a little crazy. The book is narrated in first person, from the point of view of a 40-something scientist married to an English Literature teacher (obsessed with Keats, my bff). Some things start to happen, and because you are confined to the narrator's POV, it get's more and more difficult to understand what is really happening and what it's not. Very paranoid. 
 Now, with spoilers: I read some people complaining about how the narrator's wife, Clarissa, behaves. She doesn't believe all her husband's crazy theories about how this other guy, Jed, is in love with him and wants (also), to kill him. Honestly, if you completely believed these theories while reading the book, you have a problem. McEwan plays with the paranoia of his character very intelligently: the narrator, despite being right all the time, becomes increasingly violent and paranoid and isolated from society. I think the author was trying to make you doubt the narrator till the point you think he is the crazy one -- or at least a little bit obsessed. That is what is "fun": despite him being right and the "sane one", he sounds crazy and insane. That he is right, I think, is a mere coincidence -- it doesn't erase the fact that by the end he's gone quite crazy. 
 So, yes, it was very intriguing, very intelligent. Very difficult to put aside. It was no Atonement, though.