The most important thing to know about “The Rover” is it’s an earnest, fearless attempt to explore the human soul and motion pictures as an art form. Director and co-writer David Michod’s image of the world is unrelentingly bleak, but the manner in which he presents the image is as stylistically daring as any movie to hit wide release in months if not years. Whether these grand ambitions result in a quality movie, let alone art, will ultimately be in the eye of the beholder.