Don't you know thats what my minigun is for?
But with every gun there is a drawback:
Miniguns - inaccurate past meduim range
Nade lauchers- have to arc the shot a bit and you'll be reloading a lot
SMG-inaccurate, small damage with a high ROF
AR- medium ROF, more damage than a SMG but not as strong as a minigun
Light Rifle- Strong but one is a bolt action and the other is semi auto, also both have a longer reload based on old pictures of stats
The guns are pretty much balanced so there shouldn't be a gun that is best all around.