As much as I despise the PT, you should show your kids all the movies and let them decide for themselves. Trust me, as kids get older, their tastes will change, and quality always wins out.
When I was a kid, I loved Jedi more then Empire, I liked Rocky III more then Rocky I, I liked Temple of Doom more then Raiders. As I got older, I changed my mind on all of the above movies because quality rules in the end.
Trust me, let your kids enjoy all the movies, and don't shelter them from anything, and let them come to their own conclusions.