Motorstorm is clearly a good game. It doesn't have really mature themes, Just a bit of aggressive racing. You are not blowing heads off so its not bad. When you are next to someone you can punch them off the bike or ATV. Which to be honest isn't bad. You can fall off bikes but there is no blood or visual pain. The language is only in the lyrics when you are driving. As there is a lot of background music. Its no more violent than any other racer.
Good game and very difficult.