If you read our thoughts on "Why Should I Care?", you know how important the narrator is to this story. Actually, if you read the book, you know how important the narrator is to this story.
Christopher Boone is a fifteen-year-old boy with Asperger syndrome. We dare you to find another book told from that point-of-view. This kid sees the world in a way we would never imagine on our own, and because the story is told in the first person, we get a VIP pass into his brain.
How would this story be different if it were told in the third person and we only heard about Christopher instead of from him? Reading Christopher's own take on the world helps us empathize with him, sure, but it also opens our minds to the possibility of seeing the world through a different lens. And that's an opportunity we'll seize, thank you very much.