I agree with what you're trying to say, but your example of Dan Brown bothers the hell out of me. Partially because he's a hack writer, but mostly because his books are full of bullshit.
However I think the Dan Brown books are a great example - you have to side step the made up crap particularly in the lost symbol. But his earlier books have a lot of excellently researched information.
Though I agree his works do have a lot of crumbs of informations to put someone on a long wikipedia spree :)
I'm inclined to believe, that this has helped me become a better filter for the noise/B.S from the real-world too. :)