4. = what he said. Autos have 'self-bink', which means you become more innacurate (on top of recoil). The larger crosshair doesn't indicate it's actual size of spread, but merely illustrates the fact that you're suffering from 'binkage'. Other weapons, particularly the barret, just have normal bink. You get shot, you get binked. So essentially, to counter a camper, spray your auto in their general direction. More hits means more binks, regardless of the weapons power.
Recoil (kickback) is hard to say though. You can hold an AK74 pretty steady from it's recoil due to its slow rate of fire. Just keep the mouse moving down slowly as you fire. Aug suffers more, and the minimi can be terrible for accuracy if you're running at the same time. A value called 'movementacc' in the weapons.ini adjusts the accuracy of the weapon when moving, and the minimi has more of this value than other autos. Otherwise i'd say the AUG probably has the worst recoil.