Because what would you prefer? Killing enemies whilst running, jumping, hiding, being sneaky, hoping not to die, etc., or, killing hundreds of enemies in crazy unique ways while standing in one spot and not breaking a sweat? "Old" games like that were fun cuz you could kill waves of enemies and not have to worry about surprises. I like shooters these days, but way back when, they didnt need storylines, hard asses with no emotion at all, or photorealistic scenery. All they needed was to give you a gun and say "you can't go past these points, but there are a million people between you and your objective, have fun! (pssst, aim for the nuts!) I'm excioted for these new "old" games