Since everybody else read it, I read it too. And I have mixed feelings.
It's good craftsmanship. The book makes you to read on at all times. There's not a slow moment; it's full car chase mode from the first page. I seldom read a book so fast. But... yes, you knew it was coming! After reading it, it feels thin, somehow. Or to put it another way: I cannot see why I would ever want to read it again.
If books were food, the Da Vinci Code would be a hamburger. It would be a tasty burger, all right. Nothing wrong with hamburgers. Sometimes you want one, and why not? Fills the stomach, tastes reasonably OK. But hardly a culinary masterpiece. Not gourmet food. You are unlikely to think that it's the best tasting food you have ever eaten.
So, it's a burger. Whether it's a tasty burger but still just a burger, or just a burger but a tasty burger, is up to you.
If one wants to read (vaguely) similar stories that admittedly require more of the reader but also, IMO, gives so much more, off the top of my head I would recommend Umberto Eco's Foucault's Pendulum or, one of my favourites, Lawrence Norfolk's Lemprière's Dictionary (I have only read them in Swedish). They both have dull parts, but they are ultimately much more rewarding.