The tale of Myamoto Musashi - thief, lover, rogue, then warrior, hero and master - is enshrined in Japanese culture, perfect showcase material as it were. It has been adapted more than once to the screen, and Inagaki's classy, colorful version is perhaps the best known. It is everything you'd expect from a period samurai film if you've never seen one and harbor no negative preconceptions.
After a playful first part that has a classic hero's journey structure, part II takes things to the next level without having to rush to the finish, and is the more interesting film. It allows the hero to wield his newfound power without the restraint and inner peace he will later find. It allows him the get mad, and nobody does unleashed fury like Toshiro Mifune, not when you throw 80+ armed fools in this way.
I chose to review this one because it is a good sample of the very best this trilogy accomplishes: compelling archetypical characters, lush cinematography and that "oriental" elegance that always seduces non-Japanese audiences, drawn in as they are by the very universal plot and character dynamics.
I cannot put it in the same leagues as the masterpieces of Kurosawa, Ozu and Kobayashi, but if it is to be a gateway film experience, then it is a bloody good one, and laudable for what it accomplishes.
You might really enjoy this, and if you do, it's just the beginning!