I heartily agree with the other enthusiastic reviews of this movie, so instead of repeating their comments I'll just add a couple of notes which I didn't see in anyone else's remarks.
One thing that really drew me into this movie was how, over and over, I would be watching a scene play out and there would be a _very_ few words exchanged, with minimal "dramatizing music" or other "play-ups" adding dramatic weight, and I'd just ache for more words to be said. So much was happening _to_ the characters (mostly internal, as the film focuses more on people than events) and they went through it with such a minimum of dialogue. That made a strong impression on me as it left me wanting more; wishing somehow they could make it alright by just saying more of what was obviously on their hearts.
Another thing I loved about this movie was the distinctiveness of the characters. One had false teeth; one rarely (if ever) bathed; one was called "Shorty"; and, of course, the unforgettable mugs of Palance and Marvin -- and the distinctiveness of these wasn't all simply in their appearances. Before long they started to feel like my own friends. My heart broke watching their whole world pass them by.
