I'll start off by saying i have a 5 year old and a 3 year old. I do let the 5 year old play halo solo (she likes Reach, it is easier with the other spartans to help her). I do play Black Ops but i won't play the single player with them around. More so because of the very graphic killing and the constant Fbomb, unlike Defiance Black ops drops it in every sentence.
Now would i allow them to play Defiance? My 5 year old maybe (though this isn't something that would even interest her yet). She's already heard all curse words from t.v., joe schmo at a store (seriously thats were they hear everything lol), or occasionally myself while driving, so unless it's extremely vulgar or being used in every sentence she is smart enough to know what not to say.
As for violence i grew up on doom, duke nukem, GTA, etc so i don't really buy into the violent video games breed killers, though i wouldn't let them play something extremely graphic.
My 3 year old really isn't interested in pc games much she has her leappad.
In the end it's up to you and your opinion on what's suitable for your child. Oh and it's good to see someone else raising some future gamers lol.

