What the Chinese think of Mulan
1) Disney made a mockery of "Qi" - That's not how Qi works. A person isn't born with Qi. It needs to be acquired through many years of hard and challenging breathing techniques; and even with strong Qi one still needs to train fighting skills to be a great fighter. Qi itself doesn't magically transform you to a Mary Sue.
2) Chinese culture really hates Mary Sue - The Chinese culture values hard work and character development. The idea that a person is born with ability to excel at whatever she wants is distasteful in China.
3) Chinese, while they love fantasy movies too, don't like to mix fantasy with real history. The idea that there's a witch in one of the most treasured historical legendary story like Mulan really turned them off.
4) Finally, Chinese usually want strong and powerful villains in their movies. That's how they stay engaged with the story and plot development but this movie's villain is such a joke it immediately turned them off.
These are just the 4 reasons I was told why even in China they really hated this movie.