This is pretty good. The writing style is great, and Anderson leaves a very stunning and unnerving affect on the reader throughout the book. The main character's reaction to the horrible trauma that happened to her is realistic, and I could really sympathize with her.
But it definitely wasn't as good as Wintergirls. And there were a few things I found trouble with ... the main character was quite flat, along with most of the other characters; the chapter and paragraph formatting was strange and hard to get used to; and the story was uneventful, plotless, and a bit boring. It was all about the emotion, not the plot. Nothing really happened; Anderson just showed Melinda's depression through a drawn-out 198 pages.
Also, the ending was really abrupt and unsatisfactory; when I was reading the book, I was hoping for a much more powerful and definite ending, not the indefinite one Anderson wrote. (One thing that really bothered me about the ending: I was waiting the whole book for Andy to get thrown in jail or something, but at the end he never got the punishment he deserves for all his crimes).
All in all, this book was a good read with some setbacks.
**EDIT: I just saw the movie. Wow! I'm really impressed! It was amazing. I think that's one of the three closest and most accurate movie adaptations to a book that I have ever seen! (The other two are The Thief Lord and Of Mice and Men). They did a really good job on it! I'm really happy. And Kristen Stewart acted pretty well in it - much better than she did in Twilight. :D