I took my two youngest kids (boy aged 8 and girl age12) to see this in 3D with me and my wife. My 12 year old daughter was worried about seeing the battle scenes, she doesn't like themes of war or killing. She didn't get scared like she thought she would. She enjoyed the movie. My 8 year old son thought it was very good, but he didn't think the 3D was as good as it has been for some of the other animated 3D movies we have seen such as UP and Monsters vs Aliens.
I liked the 3D, the jungle setting would have been less entertaining without 3D.