Well, after finishing "The Lost Symbol" I'm disappointed. As pointed out, it was very predictable and the ending was too "woo-woo" metaphysical. Dan Brown is succumbing to Dean Koontz disease. Every book follows the exact same formula with almost the exact same outcome.
"The Talbot Odyssey" by Nelsom DeMille however is quite good. A little dated (before the collapse of the Soviet Union" but the story and pacing are outstanding! I'd recommend it over the new Brown novel.