Yes, you are bound to be good with it.

The user noted that explosives are highly effective against KZ, but suggested that players unfamiliar with the character's weaknesses will face significant difficulty.
The main thing that makes KZ is the reload time (I feel like Rebel's already addressed this). You can just constantly spam the pistol. What I propose is to increase the reload time, or make the pistol damage less. What part of increasing the bullet speed &/or making the bullets straight is nerfing the class? The range, the curve, and the bullet speed are fine. It's the damage and reload time that bothers me.
Oh, and KZ isn't vulnerable at close range.

The user stated that the Machine Gun is powerful enough at close range to easily eliminate opponents.