Share 'What makes a movie questionable for kids'

Do not worry there are no spoilers in this discussion. However I want to talk about movie rateings and what is appropriate and unappropriate for kids. I recently saw Transformers 2 and for a pg 13 movie I was shocked at the content. If anyone else out there has seen this movie please give me your input on this movie alone. I know all the big things like nudity and things of that nature is out b...