I didn't enjoy The Lost Symbol very much... I was bored... And I did enjoy The Da Vinci Code and Angels and Demons, I know it's not literature but was entertaining.
I agree with Harry that the best part was all the trivia about Washington D.C. and it's historic landmarks, maybe next time I go to the States I try to visit.
But as for the actual plot... It was weak... And the rhythm was terrible...
m*