I thought it was quite well done, considering how much material had to be trimmed from the book - seemed like a reasonable balancing job.
I agree that not having read the book would have been a problem, but I think if viewers paid attention, they would be able to follow reasonably well. A lot of people who go to see the movie will have read the book or at least seen some of the TV or other media specials or had some interest in the back story. I had heard of the Knights Templar and the idea of Christ having descendants long before either DVC or HBHG, so would have wanted to check out the movie even if I hadn't read the book.
I find the "flagellation" the movie is receiving (though it's not self-applied) to be interesting, and related to the whole premise of the book/film...
If there really is a Sang Real and Priory of Sion, both the church and the Priory would be served by discrediting the book/film - both get to keep their secrets if most people thinks it's all fiction. oooOOOooo.
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re: Me three