[spoiler] _What am I going to do with you, Batman? You've destroyed a perfectly good giant robot castle._
- Joker, in Sengoku period Japan. [/spoiler]

I think the quote sums this thing up well enough. I like Japan in general, I love anime, I can appreciate the creators for who they are, I can even appreciate certain elements like the style and the animation. I'm also aware that cartoons often "displace" Batman, in time and/or in space. Having said all that... ooooooh boy, is this a mess. It feels like there were too many ideas and nobody was willing to let any of them go. If you're not bothered by so many staples of Japanese history / popular media all appearing in one movie, brought to you by some of your favourite DC characters (probably including more people from the Batman universe than any one movie should) - go ahead, you'll have a blast. If anachronistic mishmash in general disturbs you, you best stay away from this one.