You should read this book 1) because it's short and requires minimal effort; 2) because it teaches you something about yourself; and 3) because it will leave you with that warm, and yes, sappy Christmas-time feeling that so many elitist readers seem to think is somehow beneath them.
Here's the thing: you know going in to a book like this that your heartstrings are going to get a good tug. Add to that the back cover blurb claiming the style is reminiscent of Mitch Albom, and that's all I need to hear to send me running in the other direction. But, I felt like this book had some marked differences from your traditional Christmas schmoopfest. For one thing, while the story was predictable, it was Eddie (the main character's) journey that was gripping. His thought process was so true-to-life for a self-absorbed teenager that I found it impossible not to relate to him. And while this book was didactic in its life lessons, it was in the context of pounding it in to Eddie's thick head, rather than lecturing the reader, so it wasn't nearly as annoying as Albom's style.
But, what sealed the deal for me in making this a book I actually enjoyed is its clear explanation of what atonement means. It personalized Christ's sacrifice in a way that I could take and say, "Yes, I can choose to move on and be better. Any misery I endure is of my own making." While that may make for a simple story, it's one that we can all benefit from reading.