My Rating: 
Why? John Dies is a crazy fantasy horror book that will entertain you immensely, with a mostly serious plot veiled by humor.
Plot Tease
My name is David Wong. My best friend is John. Those names are fake. It's too late. You touched the book. The only defense is knowledge. You need to read this book, to the end. Why? You just have to trust me.
The important thing is this: The drug is called Soy Sauce and it gives users a window into another dimension. John and I never had the chance to say no. I'm sorry to have involved you in this, I really am. But as you read about these terrible events, it is crucial you keep one thing in mind: None of this was my fault.
Full Book Review
John Dies at the End is a really unique fantasy horror book. By unique I mean hilarious, sometimes vulgar, definitely crazy and with strange collection of characters that all come together in an awesome way. This book was written by an Internet geek, and if you're familiar with the culture you'll appreciate it even more. However, viewer discretion is definitely advised for this book.
It would be apropos to begin this book review with John, who I'm sure you are already concerned for having read the title. John is bats in the belfry, if you take my meaning. As the best friend of the narrator character David, John is almost always responsible for the trouble this pair face. He is overly impulsive, and a counter-balance to David's seriousness (running headlong at a pack of demon-creatures screaming like an urban cowboy, impulsive). The way he drives David crazy results in a lot of hilarious, line by line conversations that really show you these characters.