Paul Fleming’s review published on Letterboxd :
Take the Batman universe of characters and hand it over to some crazy Japanese Anime Guys and Girls and what you get is Batman Ninja. A love letter to all things Anime and to the heroes and villains from Gotham this wildly entertaining and visually exciting animated flick was great. The Bats vs Joker final fight is spectacular and the giant monkey/bat battle droid (not a mistype) made me laugh a lot. completely out there and all the more fun for it!