This movie series, based on possibly the best fantasy epic trilogy of all time, does a fantastic job of living up to the books. Though, as with all movies based on books, there are details left out, those who read the book will most likely feel that it has been done justice. The action is very well done, but it is intense, and perhaps too much for younger viewers. Of the three movies this is the least violent, and it focuses much more on the adventure than on battles. The beginning and all that takes place in the Shire is very charming, and gives a wonderful contrast to Mordor. The only reference to alcohol is in the Prancing Pony, when Pippen gets a bit tipsy and gives them away. Near the end, it can get frightening, especially when the creature of fire appears in Mordor. There is also a sad death of a character, so if you are watching with children, you should watch out for that. I believe the only disembodyments in the movie are when Aragorn is fighting Lurtz, cutting off his arm and then his head, though there is no blood shown.
The orcs can also be rather gruesome.
Despite some of this, this is a truly fantastic movie, and is best to show the movie to preteens at youngest. Though the younger ones may be able to handle the violence, they will not be able to understand the incredible story, unless they are mature for their age.
An absolute moust see.