I think Da Vinci Code is unnecessarily hyped. It sure helped the book though 🙂 The claims he makes might seem incredibly persuasive to someone who doesnt know the other side of the story.
But when you actually dig in deep, there are lots of fallacies that would crack the case. Whoever is convinced of Dan Brown’s side of the story, should take time and effort to listen to the other side too, and then decide for himself/herself.