13 Assassins (2010).
Jidaigeki (samurai film), check.
Crazy director who is no slouch at violence, check.
Cast of new and old faces in Japanese genre films, check.
Respectful remake of classic film, check.
Hits ALL marks that make samurai films compelling, particularly giri/ninjo (duty/conscience) conflicts.
Has TWENTY times the action quotient of recent samurai films like Twilight Samurai or The Hidden Blade, check.
Has flashes of director's trademark grotesquerie and weirdness, check.
Uses real martial arts training scenes and has frightening fight choreography, check.
Awesome Blu-Ray edition, check.
I'll cover this film in more detail after I've composed myself. Nonetheless if one is a fan of samurai or martial arts films in general, RUN, do not walk, to catch this movie. It has been released on home video here in The States.