Regardless of what gameplay and content there is, the theme of a game will be instrumental in determining if people want to play it.
I imagine there are some well designed childrens games out there but do we play them? No, because we don't want to play a barbie game or whatever you want to insert there.
A game that takes place on an isle of panda humanoids that gets most of it's influences from chinese kung fu culture is a far cry from what we've had before, and you really cannot blame people for not wanting to play it for that reason.
Also, my gripe with CRZ is that it only makes leveling worse. With modern leveling, where you absolutely never need to interact with other players when out in the world. CRZ does nothing but make you have to deal with gankers from 5 different realms instead of one. An utter failure of design.