Sometimes the sign of a truly great artist is that they never want to stand still creatively; The Beatles certainly didn’t, David Bowie definitely didn’t, and in the movie world, there are some directors who simply couldn’t ever envisage pumping out the same genre of film over and over again, Martin Scorsese being one of them. Much as he is deservedly renowned as the undisputed king of the mob movie thanks to the awesome Goodfellas, Mean Street…