I found Mulan just as brave and courageous as the movie, so congrats to the author for bringing along that aspect of her personality! (Indeed, she and Tiana may be the only Disney princesses who do something about their fate.)
I liked the occasional details on strategy and weaponry, and the uncovering of her within the camp. On the negative side, Mulan's heart was swayed quite easily.
I think Mulan ought to have proved herself more to Prince Jian that she was as his equal as a man.