With the changes to Sprinting and Jumping, C3 has become much more of a CQC (close quarters combat) game.

Lets face it, with unlimited S/J it makes it much harder to hit (experienced) players at range, and if you do hit them its much easier for them to get to cover. Add in maneuverability and its silly to even take shots at someone farther than 10m.
(Keep in mind, to accurately hit a player at range means standing still and firing a multitude of rounds at them- something that is just asking for a knife to the throat or a sniper headshot)

This is why players have had issues w/shotguns and the typhoon.

Long story short, the range of the gun (excluding Snipers) doesn't really play a role in the guns lethality. Rate of fire, Stability, Mobility and Damage are the factors that matter in choosing the best guns.

For those who have issues w "OP" guns- it is not the gun, its the style of gameplay C3 creates that promotes this.

P.S.
Forgot to mention AA as another factor that encourages CQC.