I loved it...I read it before Angels and Demons, and think it is the better of the two.
The best Dan Brown book though, in my opinion is Deception Point. A great thriller...nothing to do with the bible. Only Angels & Demons and the Da Vinci Code are based on religious beliefs/myths, etc...By the way, for a non catholic, I thought he did a good job explaining how the process of selecting a new pope is done in Angels & Demons.
Having read Angels& Demons, I found the scenes at the end of EuroTrip so much more funny than I would otherwise.