A very good adaptation, and a decent film in it's own right. Does a great job of turning a somewhat ludicrous anime, into a pretty realistic period action piece. Some solid camera work and direction in general, which I don't see much of from live-action Japanese movies these days. The swordplay is also very nice and generally quite grounded.
Sure there are a few exaggerated quirks here and there, but they're by no means glaring. Perhaps a little over-long? Maybe because it was late at night and I was getting tired but about half way in, I had started to lose a bit of interest. Still finished it, 3.5/5 is the result.