LOWER DEPTHS perhaps isn't the place to start if you're completely unfamiliar with Kurosawa - but it still ranks as one of his great films, and definitely one of his most underrated.
Based on a Maxim Gorky play (an earlier Jean Renoir film draws upon the same source material), LOWER DEPTHS seems a bit stagey at first, but Kurosawa manages to enliven it considerably - the performances are all top-notch, and the combination of skillful editing (straight cuts only here, but the usual Kurosawa multi-camera shooting method) and inventive set design (with diagonals and angles trapping characters, heighetning the intensity of the dialogue and acting) making this an unforgettable film to watch - easily as accomplished as the better known THRONE OF BLOOD from a little earlier. One will definitely note how tightly constructed - in all ways - this film is.
This film does (along with IKIRU, RED BEARD and HIGH & LOW) illuminate some of Kurosawa's underlying philosophies, specifically a sense of social realism in cinema that can cast a critical gaze upon injustice, and in this film a sense of anger and frustration is articulated with an unusual degree of eloquence, testament to both Kurosawa's technical virtuosity, and his greater awareness of the world.
But for all of the cruelty on display here, there's an equal amount of humor, typically irreverent and loaded with sly social commentary, but also spontaneous: the two impromptu musical episodes, which blend Japanese theatrical conventions with a Chaplin-like sense of visual choreography to very striking effect.
Not as well known as SEVEN SAMURAI, THRONE OF BLOOD or YOJIMBO, but just as accomplished - filled with delight and insight.