Like many others, I read The Da Vinci Code ....
out of curiosity. I thought the movie was much better than the book. Somehow it didn't seems as shallow as the written word. Dan Brown's popularity stems from the fact that there are a lot more people out there that can read such trivia than there are tose who can read literature. If you want to read it, then do so. IMO, howver, it's a waste of time. I am a fast reader, and the book is not .long, so I satisfied my curiosity in a minimum of time. I wouldn't read another Dan Brown book.
There have been other writers who are very sorry at the writing craft, but who have attracted many readers. Ann Rice is one. And for the life of me, I can't understand the attraction that Ayn Rand has for some readers. Acually, reading Dan Brown is not such a waste of time as reading Ayn Rand since it takes much longer to read her books, although they are not much better.