Too much violence?
John Trevellian (a one time well known British Film censor) once told me where his main concerns lay. The normal sexual act was of little concern. It's how we got here anyway. However violence was another matter. He felt, as I do, that you can become desensitised to violence. That a dozen digital dead men lying on a digital battle field, was hard to tell from a dozen real dead men lying on a real battlefield. Especially for children. We are probably breeding a race of people who think that the only solution to anything will be a violent one.
Such games glorify violence as a viable way to settle disputes. I find them quite sickening, but then I am no longer a twelve year old!