Don't watch it for the cinematography or the special effects. Don't watch it for the acting, music or costumes.  Just watch it. It was never meant to be a blockbuster, just a low buck art film. It is not a shining example of any of the casts best work, but it has a deep message and is a window to the era.  I suppose if we were living in that era it's avant-garde message would have stuck us and we would have cheered the performance.  Today, not having lived in that era, and spoiled by modern techno-cinema, I missed a lot, but I did see many comparisons and points that were trying to be exposed.  Compare them to today.  I dare you.  After you watch it then run the commentary or the special features and see if your observations were correct.