From Book to "The Big Screen"
I have seen many many novels translated to a movie, and have almost always been left lacking. For the most part, there is almost no way that you can shrink a novel into a screenplay that lasts 2-2 1/2 hours... something always gets cut out, glossed over etc etc.
What I have found is that the television mini-series is a much better avenue for getting a story on the screen... its just on the teley instead of a movie screen. Roots, Thornbirds, Lonesome Dove etc etc. were all more complete than if they were brought to the big screen.