Angels & Demons: 7 out of 10.
I should just copy and paste over my review of The Da Vinci Code. I didn't read that book and I didn't read Angels & Demons. In both instances, I heard negative press, and watched the movie cold.
I'm almost ashamed to admit I didn't mind Angels & Demons. It was kind of interesting, and very nice to look at. It's a little long, but if it's on demand and you've already paid for the TMN subscription, give it a whirl.