The best book, like the best speech, will do it all - make us laugh, think, cry and cheer - preferably in that order.
I watched a couple of really bad directors work, and I saw how they completely botched it up and missed the visual opportunities of the scene when we had put things in front of them as opportunities. Set pieces, props and so on.
If you look at yourself as a star, you've already lost something in the portrayal of any human being.