The whole series is impressive. Yet this is way lower in quality. As another reviewer compared it with the Tarantino junk, well, for those there isn't any drop in quality.
I'd say it's impressive to keep such a long series till the first movie of a lesser value. This is the first one with a complicated to shady story line and at this point they try (why?) to experiment with a different kind of cinematography. And while the dynamic scenes are a bit weird, things like the beheading are way out of their league... It's more inexplicable as the series so far was good enough skipping gore and close-ups.
Also, there is no need to relate this series with Kurosawa. Kurosawa, a samurai descendant, made movies about the life and honor of the important people. People who went for the art and not for the craft. Zatoichi is made by actor descendants (quite at the opposite side of the social scale) and it's about life and death and less about the craft. One is telling the stories from above the peasant class, in a contemplative manner and the other is telling them from the back streets somehow looking up to the stability of the peasant life.
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