Are they purposefully dumbing these movies down?
Compared to the two sequels, the original Kung Fu Panda was a bit more complex and infinitely more subtle in regards to the struggles and development of the main character. In the sequels, the struggle and the "solution" is something that's repeated like a mantra throughout the films "INNER PEACE!!" & "CHI!". However, neither film really fleshes out those constructs beyond Po rather magically doing something related to them that enables him to defeat the enemy.
The first film, by comparison was rather brilliant about it though. True, on the surface, it was "be yourself" or "it's just you" but the real way in which he was able to defeat Tai Lung was that Po was just too fat for the nerve attacks to work (something the film very subtly developed). Watching the 3rd film last night and seeing almost the same exact treatment of this plot device that the 2nd one did, it had me wondering if the filmmakers are doing this intentionally to help the films connect with younger viewers. Are they?
You'd feel cocky too if you were full of myself.