The Huns, led by the terrifying Shan Yu (a villain with no song, just menace), are not bumbling oafs. They are a slaughtering force. The film does not shy away from the cost of war. The scene where Mulan and Shang discover the decimated, snow-covered village is haunting precisely because it is silent. The music stops. There are no jokes.
The writers (Rita Hsiao, Chris Sanders, and others) managed to do something brilliant: they kept the skeleton of the legend—the aging father, the stolen armor, the twelve years of war—but injected a distinctly modern conflict: the fight for self-respect rather than romance.