So, if SO many guns are OP, wouldn't that mean that they are all EQUAL? This would make some guns UNDERPOWERED, not most guns overpowered. What you are suggesting is that all guns need to be lowered in power because your reaction times suck. Now it's almost as it should be as the person who shoots first usually gets the kill. No more 2-3 bullets into someone only to have them sprint away and have a magical health fairy heal them to absorb more damage.
Three shots is actually sometimes TOO much, It should be a ONE SHOT ONE KILL to the head NO MATTER THE WEAPON.
About the ONLY good thing in this game is that the time to kill has been reduced to a manageable level in core. No more 5-6 shot bullet sponges (unless you're in a laggy lobby).