I think Dan Brown's books are always good. If you liked any of the others, then there's a sign you should read the new one. I've just finished it, and it's very fast-paced and exciting, one of his best in my opinion.
The only reason anyone has a problem with him is because he wrote a fictional book about religion. I think he's a good writer. Christians just can't get over the fact he didn't mean anything by it; he said himself that the book is a work of FICTION.
Anyway, that's my two cents. Enjoy!