I wouldn't say it's the best YA fiction I've ever read, but Thirteen Reasons Why does grip you and keep you reading until the end.
I can see where the other reviewers are coming from when they say that Hannah's reasons don't seem quite enough- not only to for her to kill herself as she does, but to be so angry about it. She seems desperate to make everyone on the list suffer- and actually, throughout the book I found myself dislking her character. I just wanted to shout at her- "GET A GRIP! GET OVER IT!" I mean, all teenagers know what rumours can do to you in High School, and it's horrible, but Hannah really does take teenage overreaction to another level.
That said, however, the way the story was unravelled was fascinating, and throughout I was desperate to find out who was next on the list. A good read, but it probably won't change your life.