This is an unnecessary cliché-ridden formulaic shadow of a good anime film. It's predictable with an eyerollingly bad script that was based upon a one-page note something or other that Tolkien wrote in one of his appendices.
The only (and I really mean ONLY) redeeming quality is Brian Cox as King Helm Hammerhand. He plays the role with joyous overacting abandon. The rest of it is a slog, including the animation.