This movie should not be rated G.
There are some good things about it, which I'll review first:
Pixar comes through with their usual great animation.
McQueen is embarrassed by his best friend, Mater, and tells him to stop acting like he's in Radiator Springs. Later he realizes that he is supposed to love and accept his best friend just the way he is.
Lots of funny tie-ins and one-liners. Adults catching the little side jokes will be amused.
Slapstick humor was much appreciated by our 8 year old child.
Michael Caine is great!
This show is very violent. In the opening scenes, the first guns come out and it just goes on from there. Guns everywhere!
There are several violent deaths. A secret agent is horrified to see his colleague has been crushed into a cube. One car falls to his death, smashing into bits after hitting the sea from a great height. Another car is tortured when its gasoline is superheated and he is boiled from the inside out, eventually exploding.
One scene depicts a car cornered in the bathroom, beaten and taken away. He is the one who is later tortured and killed.
The bad guys continually threaten to kill other cars, and of course try to follow through on the threat. Characters are placed in grave danger of being crushed, shot, lasered, or bombed. Some escape, while others do not.
A bomb is strapped to another character who is unable to remove it or deactivate it.
Bottom line: Adults and older children may enjoy this, as it is entertaining and amusing. However, the happy Cars whose biggest problem is a beat-up road are gone, replaced by Cars who must deal with terrifying life and death scenarios. Cars 2 is a pretty good action movie, but not a great movie for the younger kids.