If I could give this film a lower rating, I would.
The new characters were very bad. Zhou wasn't that good of a character in my opinion for the fact that we would compare her to Po.
There is a scene in the film around the end that grinds my gears to the point of being insulting, and if you were expecting a Tai Lung centered story, you would be dead wrong. Tai Lung and the other villains are there just for fan service, and nothing else.
Honestly, the story would have been better if Po remained the dragon Warrior. Heck, it would still work with the main villain.
Don't watch this film if you don't want to see retcons, continuity errors, and overall lazy writing that doesn't belong in a KFP film.
Need anymore convincing? I saw people walking out of the theater not even half way through the film