DS6 saw it this weekend and loved it. (That being said, I think I got more out of the movie than he did. Our DS is practically Max to a "T"). This was DS's first time seeing a movie in a theater, so it was a whole new experience all around.
I saw *a lot* of younger kids at our theater. At home on the smaller screen I wouldn't have a problem letting our younger child watch it. The theater experience may still be a bit too much though.
Our kids are not overly sensitive when it comes to movies so your mileage may vary.
JB
