I found the book to be paradoxically entertaining and annoying. On the plus side, It is a good story with a lot of twists. I appreciate the fast pace and the layers of discovery, which even shock scholars like Langdon et al. Over and over. Annoying.
Moreover, I definitely felt similar to Mister Lennox concerning the thesaurus issue - there is an indulgent use of obscure words that only loosely describe what is intended throughout. The inaccuracies are very disappointing as they throw a shadow of novelty to the novel which then, for me, makes the theme of God and Catholicism seem devaluing. It didn't really sit right with me. I can see why it has became so popular because it seems so sensational, and maybe it seems to give the reader more fulfillment than an average novel in terms of historical and cultural knowledge - but it is a load of bollocks, really.