I have NEVER understood the argument about "When an enemy shoots first, I can't return fire and win".
First off that should NEVER happen unless the person shooting you has the aim of a blind monkey standing on it's head. With the average death in Core taking 3 rounds to accomplish, the human brain simply isn't fast enough to comprehend "I'm getting shot, spin in direction of shooter, aim my gun, fire with pin point precision at my target, land 3 bullets, and win the gunfight, before the enemy can land the rest of the bullets to finish me off". It literally takes MILLISECONDS to shoot the 3 bullets necessary to get a kill, and it is PHYSICALLY IMPOSSIBLE to react with precision, and identify the target and land 3 of your own shots before the enemy lands the other 1-2 it should take to kill you. If you are used to this outcome, you are getting lag compensation in your favor.