Have you completed the Campaign Mode on elite settings? I'd like to say that I'm on the last mission on elite settings and I have learned alot about the game. The game plays at amazing speed. Players that can play at these extreme speeds could care less if they are detected. In the 10th or 11th mission in the campaign on elite settings, you are challenged to tear through 5 levels full of mobs in two minutes flat. Players that can accomplish that, and I will soon, could care less about being detected. So it is either shooting the detection devices, or moving at speeds that it does not matter.