I tried Halo, which my 35 year-pld son raves on about...couldn't even get off the transport ship in the opening sequence.
I've "killed" everybody...just hear the loud cadenced warning sound (like in the Alien movies), but alas, I'm unable to find a way out of there. Just smoke and dead monsters and that damned buzzer sounding.
Turned it off and never plugged it in again.
Everyone I know who has video/computer games for their kids regrets ever getting them started on it. They say, "Never let the first one in the door."
One family is in the business of designing the games and systems, and they have a house rule: our work doesn't come home."