Some objections/suggestions

First of all the voices that are used in Kung Fu Panda Legend of Awesomeness are far better than those that are used in this movie. This is especially true for Master shifu. Dustin Hoffman's voice doesn't really fits his personality. At higher pitch it starts cracking and ruins the whole scene.
Another thing that bugs me is that in one scene an entire boulder many times the size of Kai is broken when Kai hits it. If something is that strong then no kicking or punching should affect it.
Master Shifu alone should be enough to defeat the entire village but then Kai let loose several accomplished masters on the village but they are all defeated with some silly moves.