I really dont see what the big deal is, i played manhunt 1 when i was 12/13ish, and completed it 3 times. Its violent yes, but no more than GTA or something, i didnt pay much attention to the violence i was just playing a fun and and entertaining stealth game which was actually pretty good. The Violence level is smilar to Hitman imo, for example in Blood Money you can sneak up behind people and stick a hammer in the back of their heads, you hear the crack and spurt and everything, manhunt is not worse than that. And if its similar to the first game, the Killing is not pointless like most people do in GTA, its for a reason, you kill or be killed, GTA you can go up behind people in the streets and slit there throats and beat old people to death and steal there money for no reason, that is imo more violent as its a more realistic setting.
Its pathetic that its getting banned, because underneath all this hype about violence which isnt even more violent than a game like GTA, its actually a fun stealth game which i was looking forward to playing.