Actually, gentelmen, I'm going to go out on a limb here and argue that there should be limits to what can be shown, particularly in a game. Games teach attitudes and skills. This is a fact exploited by games like America's Army, and DIVE. So danger 1 is that you may be training people at a very low level to be accepting of ultra-violence. I'm not saying it's teh same as going shopping in downtown London on a summer saturday, but it's an effect.
The second danger is that violence, real violence, is bloody appalling. The closer we get to accurately representing it the closer the psychological impact becomes.
Really I guess all I'm saying is that while Manhunt may not be the line in the sand, there has to be a line. My question is where should that line be?