Since this is a movie for kids, there is definitely too much violence in it. Cars (representing people) are being killed, threatened to be killed, shot at or even have a bomb planted on their body. That's not something I would like to watch with younger kids.
Secondly there is the political agenda. I'm an adult but even I felt being indoctrinated while watching the movie. Movies for kids should entertain and teach universal values not political agendas.
Lastly the plot is way too complicated for kids. The whole espionage story seems to be fabricated and will only be resolved at the very end of the movie. Children won't be able to follow through or understand it.
Though the 3D version of the movie is awesome on a technical level, it was not worth my time at all because of the violence, complicated story and the political indoctrination.