My husband and I went to see Brave without our kids so we'd know if it was a good movie for our kids to see or not. We researched it beforehand - watched lots of trailers and clips, read reviews - and nothing seemed to point toward how violent and scary it is. However, the scary aspect of the movie wasn't necessarily what bothered us most.
I did not like the emphasis placed on the cleavage of one of the female characters. There are several instances where this character's bosom is a focal point of the story and the animation itself. It is gross and not appropriate for children. Also, the naked backsides of the king and others crosses the line. Earlier in the movie the whole idea of "nothing under the kilt" is poked fun at, but to later see the complete nudity of male characters from the back is too much. Just because it's animated doesn't make it appropriate. The same is true for the implication that the queen is naked under a blanket with an army of soldiers surrounding her. Attention is drawn to things that aren't needed in a children's movie.
My final complaint with the movie, however, is a subtle message that is anti-marriage and anti-authority (specifically the authority of parents). Merida gives no reasons why she does not want to be married except that she will "lose her freedom." In the end she becomes the first Disney princess without a prince. Instead, she promotes the idea that it is good to break with tradition - good to create "her own story" - which is not, in my opinion, a coincidence of the storyline but more of social agenda. The reconciliation she has with her mother is likewise disappointing, because instead of remaining in the role of parent, her mother suddenly becomes a BFF. (This is even implied by the fact that her mother now wears her hair down instead of in restricting braids).
All in all, my husband and I really wanted to like this movie and feel like it would be a good match for our family to enjoy, but we were let down. The animation is stunning, many of the characters clever and engaging, but there are just too many things about the movie that make it questionable for a young and impressionable audience.