Gibson's writing is good because he develops incredibly complex social systems and structures for the reader to navigate. He does this mainly by leaving gaps in the world that the reader has to imagine or guess at. Some of them are filled in, as the plot progresses some of them are filled in and explained. This is incredibly difficult to do well in film. Directors are always tempted to show everything and producers demand it if there is the budget for it. The world becomes simpler, flatter, maybe a little silly.