The plot: In the far future of 2012, a warrior sells his services to the survivors of post-apocalyptic New York.
While there are some obvious flaws to this film, it's clearly a forgotten classic of the era. I don't see how you could possibly go wrong with Yul Brynner kicking ass in post-apocalyptic cities. It's been a long time since I saw this (probably cable television in the 1980s), but I can still quite clearly remember several of what have become (to me, at least) iconic scenes of 1970s action/adventure/exploitation. If this film got broadcast regularly (instead of other inexplicable cable TV favorites), I think it could really attract a cult following.
For an obvious genre film, the cast is amazing, the writing and directing are better than expected, and the rest of the film is forgivable. Why? Because the flaws pale in the face of a shirtless Yul Brynner standing in the center of a city plaza, waiting for someone to bid for his services. What do action heroes do when they're not fighting bad guys? Why, they just stand there and wait for the plot to catch up to their awesomeness, of course. It's brilliant. If this resonates with you, then you simply must watch this film. If you're going to start asking questions and trying to debate this inescapable logic, then you should probably watch The Shawshank Redemption instead. That's a great film, too, but it doesn't have Yul Brynner knife-fighting with post-apocalyptic gangs.