Didn't feel bothered to watch the movie. The book did capture my attention and I read it in one sitting, eagerly turning pages. I don't really read many books so I can't honestly judge how it rates against other conspiracy-theory type plots. But if you haven't read this book already, you probably aren't a book-type person and will probably like-or-love it. And I saw the ending coming from a mile.
I can't say for sure if I liked it more than Angels & Demons (which I read after this book). Both books have their merits and interesting parts along with the boring parts. But interesting nonetheless. (Just don't question the authenticity of the author's claims and go with the flow)