Didn't read it and won't see it. There's so much real history out there to enjoy, I just don't care to waste time with pseudo-historical novels.
I have a friend, a land-use attorney, who is a really smart guy and deeply Catholic. When the book first came out, I remember him describing the mystery of The Last Supper to me and how it had challenged his faith. I remember asking him point blank: "Mike, you're kidding me, right?" I am surprised at how little some people know about their faith.
The Vatican has certainly given the film millions of dollars of free advertising. I think it would have been better to ignore it.