I am right there with you, I really miss the 70s style sci-fi, (pre-star wars)
where they had great dystopic stories that were usually depressing.
Modern Indecent and Foreign sci-fi films are sometimes really good if you can overlook the issues that come from filming with a small budget.
Nothing beats Le Planete Savage in psychedelic dystopia. Second place goes to Gandahar. Third to Zardoz. Fourth to Logan's Run.