I think Mulan is underrated, along with Pocahontas. However the movie itself was a big lie. As if the English didn't kill the natives with guns & chicken pox. Pocahontas was a little girl taking from her land & married off to a older white man. She died on the ship. She never made it to wherever they were going. But it was a good movie... A lie but a good movie.
Those who are looking for Pocahontas and Princess Tiana can still look for an specific items with Pocahontas and Princess Tiana on them, also if Disney was an truly racist then they was not having non-white characters at all. :)
I don't think its racist, but I think that they have the others more because they are considered the "classics". Cinderella, snow white, the little mermaid... They are classics and are basically their trademarks.