I don't usually do this, but since this is a themed month, I figured I'd call attention to a review I posted over at BlogCritics:
Movie Review: The Shinjuku Incident
Just to throw it out there, you should check out this movie if you want to see Jackie Chan's chops in a sweeping yakuza film where he doesn't do any comedic over-acting or kung fu whatsoever.
Grittiness rating: 7.5
The fight scenes are mean and the morals and politics are ambiguous. However, it doesn't reach the heights of cynical intimacy that seriously mean, gritty movies can attain. It gets an extra boost because it involves the yakuza, and because it didn't pass Chinese censors... and because of the occasional dismemberment.