This one was just kinda "meh" for me. It was paced well, it had great plot twists and tons of the misdirection and historical geeking out that I've come to expect from Dan Brown. What I've come to realize is that, in my humble opinion, while Brown has excellent ideas, he does not relate them very well. I find his writing somewhat juvenile, not in that he should be writing for Tweens but that it sometimes feels like a tween is doing the writing. I don't personally need to know the brand name of every hi-tech piece of gadgetry with which Langdon or any random sub character comes in contact. 
 I also find these books a tad formulaic for my taste, almost as though, since A&D he's been using a template and just inserting new character names. 
 Meh. It doesn't stop me from devouring the books, just from truly immersing myself in them. Just my thoughts.