I liked the movie, but one big character point prevented me from liking it more (in addition to the overly long CGI monster battle at the end):
-- Shang doesn't seem to really want anything. The main thrust of his arc was about him "no longer hiding from himself" - to embrace the good and bad in himself... or something. Various characters tell it to him, but I'm not sure how the plot or Shang's actions really show this journey for him. He initially fights to protect himself, then he wants to protect his sister, then he wants to protect the village, then he has to protect the world. Each step along the way he's put in a position to fight as the stakes get bigger, but aside from deciding to kill his father, then changing his mind, I didn't feel any journey like the dialogue kept insisting was his arc. Even after he obtains the rings, they clearly show us that he's not really changed. He's just put in a new position where he'll likely have to do more fighting.