I'm not sure why everyone seems to be comparing Pandarens to Kung Fu Panda. It very much depends on how they pull off the character, Warcraft 3 pandas were bad ass (http://www.youtube.com/watch?v=028qkDLiyp4) while the former tend to be in the comedy relief category.

Most of us play without sound anyway so I guess which ever way the character is voiced you hear what you want to hear within your head and what you want to imagine.