My parents got me an xbox when i was 13 with Halo, then Grand Theft Auto and various 16+ 18+ games, Call of Duty etc, my dad saw me playing GTA one day and said be careful lol. I used to play these games for hours on end and being exposed to that kind of stuff never did me any harm....plus i've lived my life in the real world, drinking, womanising, shooting, fishing, driving etc...
I can't have a bad word to say about the games, the 'real world' is a nasty place anyway