I enjoy Dawkins, but as far as atheistic books go, I don't think his is one of the strongest in the field. I think it receives so much attention because it is quite polemic. I would recommend it for anyone questioning religion, but I maybe wouldn't recommend it to be the first book that they read. I feel that he does rely heavily on Darwinism to refute theism, which is his specialty so I don't blame him. I really like his book The Greatest Show on Earth though. My favorite atheistic book is Why I Became an Atheist by John Loftus. Loftus is a former minister and a theologian. Because he has been on both sides of the fence, his arguments just seemed a bit more well-rounded to me because he knows how Christians think.