Because a film may have some comedic elements it does not make it a comedy or even a funny movie. We often have amusing scenes to "break the tension" in "serious" ventures. This was neither of the above - not a comedy; not a "serious" film.
Nor was this a Chambara film. There was swordplay, but the artistry of the blade was missing; and, there was but one scene where steel was drawn.
So, we are left with a story of a sheriff who comes to town, and cleans the place up. I mean Samurai. It's your typical Eastern-Western that holds no surprises and our hero never needs to reload his blade.
It could be that the collaboration of four of Japan's greatest directors makes this film a bit of this and a bit of that and a lot of disappointment.