After looking through the third art book, it makes one one wish mei mei could be discovered more as a character. She could've have been quite a dimensional character in the third movie. Of course they really wanted all spotlight to be on Po and his father, so they kinda ditched a lot of possibilities.
I feel like PoD displays her in disrespectful way, in comparison to the third movie and Panda Paws. You could tell in the third movie she wasn't necessarily fully confident. It always made her more interesting to know she wasn't a one-faced character. In PoD I feel that the writers have undermined mei mei's personality, as they have exaggerated her pushy nature.
This show has done wrong to many of the characters from the movies. And for what? A bunch of characters we probably won't see again after the series is done anyways. Very frustrating.