Firstly, I do not see how this promotes violence, E rated games sometimes do. There is no blood or violence really, Language is background music. But h*ll, da*n and a*s normally. Great game, Shame about it being very hard and frustrating.
Being a girl, you'd probably be surprised that I would like to play this kind of game. However, this game is super fun! To make it short, Motor Storm Pacific Rift is basically about you racing against other people in all these different terrains. You want to aim to get first place. You can knock off people from either their motor bike or their ATV using a button on your controller. I wouldn't consider it very violent, but it's not something that you should do on a regular basis. Other than that. There are no issues, but it is a game that can become violent as there aren't any rules. It's as great game!
It's a very good game, and the physics are also quite good. It can be violent, but if you don't like the music, just TURN IT OFF. If I am correct, one could make a custom music track using files on the PS3. I did experience my character fingering another one(Triggered by pressing the square button on a bike or ATV when near enemies) but it is one in a series of taunts, and I haven't seen it since.