Cloud Atlas blew hot and cold for me, certain sections I lost intrest on and I found myself wanting to get past them back to sections that had me hooked.
Totally agree about on the road, I think timing's definitely the key.
I think with the Da Vinci code, Dan Brown just tapped into a subject that struck a chord with the public. The holy grail, fine art, secret socieities. Once he came up with that concept (or stole it off the Holy Blood and The Holy Grail ) he could knock out any old fare and it would sell. That said its excellently paced and I did read it in a couple of sittings. Angles and Deamons, I know people think its better but pope's jumping out of helicopters with bombs strapped to them is was a bit 'out there' for me, thats really stretching it!
My girlfriend and I read Chesile Beach to each other in a park in Rome recently, which you might say is corny but she's kill me if I'd said it was dull!