Batman: Vengeance is based on the TV cartoon that ran in the 1990s.
Though the show drew inspiration from both Tim Burton's blockbuster motion picture and the official DC comic series, the Batman cartoon distinguished itself with its outstanding voice acting (featuring the likes of Mark Hamill, Roddy McDowall, and David Warner) and its distinctive look.
All of the cartoon's scenery and characters looked extremely simple--Batman himself had a literally square jaw and a pair of triangles for eyes, but he always looked great leaping into action against his enemies, thanks to the cartoon's extremely fluid animation. Batman: Vengeance tries to capture the look of the cartoon series, and in some ways, it succeeds.
Its characters, especially Batman, look much as they did in the later years of the cartoon show, and many of them, especially Batman, are animated extremely well.