I didn't see anything that really warranted the PG-13 rating. There was no swearing and no hint of nudity. The results of the lava planet fight MAY be a little scary for young children, but I thought the "scare factor" was very mild.
As for my review, it was definitely worth the wait. Palpatine was extremely evil and Anakin's change to the dark side was very believable. Grievous, with his hunched look, appeared to look pathetic until he started fighting. Yoda, once again, showed why he had the reputation as a "great warrior" in Empire. Even R2D2 had his moment in the sun in "Revenge". This movie should make anyone view the original trilogy in a new and improved light. It was not without flaws, but I thought it was an excellent movie.