Bests & Worsts Reviews from Amazon

I pitched this book to my book club because of all the amazing reviews and I sent them an apology last night telling them that if they hadn't started it to be weary... I just don't get the hype at all. The synopsis to me is: Dull, idiotic man becomes obsessed with mental patient and proceeds to try to help her in the most unprofessional ways possible. What am I missing? The writing is fine but nothing interesting happens in the book until about 35% in, and even then, I'm not rooting for anyone and find the main character frustratingly dense. Not for me - and I love a psychological thriller usually!