I was somewhat hesitant about this movie since I'm not a big fan on animated films or sci-fi. However, the fact that James Cameron's movies are top-notch, I bit the bullet and paid $14 for a ticket. And I'm not sorry I did. The film was great. Long at 2 hours and 40 minutes but you wouldn't know it. The time flew as I became enamored of the Avatars. This is a must see for all. The PG-13 rating is likely for the violence, as the Avatars and humans fight with bows and arrows and hi-tech weapons. If your kids are mature enough, it's ok for those under 13. My 10 year old son and 13 year old daughter really enjoyed it!