"More enjoyable than persuasive"
Atheists suffer the same basic weakness as the religious. They believe themselves to know the truth. This author, thankfully, doesn't have the all-knowing tone of, for example, Richard Dawkins, and that makes the book a more enjoyable read. Hitchens freely admits that, for a long time, religion was the only option to explain much of the world. Contempt is reserved for those who, when confronted with new knowledge, retreat from it. I've no doubt it would still piss off the devout...but the book explains the reasoning behind atheism in a very straightforward, comprehensible way. This is the book I'd give to my mother to explain why I won't go to church with her anymore.
Final note: Looking at previous reviews, I'm compelled to mention that I understood the author's voice perfectly. I believe having him read benefits the presentation, since it adds genuine emotion to the reading. But, I'm using an iPod. Your results and sound quality may vary.