The Fault in Our Stars
I can take or leave John Green.
I enjoy his books but they aren't my favorites. Of the three I've read, one has been a 3 (Looking for Alaska), one was a four (this), and only one was a 5 (Will Grayson, Will Grayson). You won't find me amongst his nerdfighters, but nor does he irritate me as much as the small but vocal group of detractors he has amassed. Yes, he can be pretentious. Yes, a lot of his characters act the same, think the same, etc. But still, he can turn a phrase. He can make you care about his MPDGs.
I think the key to enjoying his books is to space them out. I read about one a year, and it keeps me from noticing (too much) the similarities between them all. Another reason this is rated so highly is purely personal. I read it on the anniversary of the death of someone I loved immensely. Someone who died at 19 - way too young. Someone who was funny, handsome, and full of life. So I am not the be the most objective in how I feel about The Fault in Our Stars, but Green knows how to write grief. It got to me, it resonated with me, and this book will stick with me for all these reasons.