Po never really disappoints. It’s again a fine story but you can’t tell the same joke over and over again and expect the same result.
In my opinion, the biggest problem of Kung Fu Panda series is a main “bad guy”. You can feel how the villains are flat, like the story was always created without them and they are forced to the story because hero needs a Villain. Someone somewhere said:
A hero is only as good as his villain
This inability to create at least average villain for the Po’s story and the repetitiveness of once told jokes and main plot are the two key factors which are turning down the whole movie. But you can always watch it with kids because there are more pandas than ever before.
Could child resist to that?