Getting shot in say Deathmatch sucks but isnt really that big a deal. Respawn and know that your foolish killer got almost no points.
Getting shot in Corruption ruins your scoring chances severly. Stunning someone, running for a new hide spot only to get shot has your points lowered severly.
It dosent exactly help that they only need to aim the thing for 0.2 seconds before they can kill you.
So for AC3:
*Make sure you need to aim the gun for atleast 2 sec before you can kill
*Add gun immunity perk