Warning to anyone planning to watch this: DO NOT EXPECT THE PLOT TO MAKE SENSE. The plot is a complete and total clusterfuck and does not even begin to make sense no matter which way you look at it. If the ending says what I think it says, being Kuro is the worst hell. The recursive plot reminded me of Highlander: Search for Vengeance.
Okay, now that I've got that out of the way, let's focus on the specifics.
Art: Amazing. The art is really well polished, on par with Hellsing Ultimate.
Animation: Smooth fight scenes, lots of slow-motion and special effects. High quality animation.
Choreography: Pretty good, the sword fights are quite nice to watch, Kuro utilizes a lot of acrobatic moves which are nice to see. I would say that it's at least on par with Highlander: Search for Vengeance if not better.