The machine gun is not a defensive weapon. The machine gun is weapon for
suppressing the enemy in both offensive and defensive situations. Learn to use
the machine gun to hold off the enemy so that your team can advance.
Try to deploy the machine gun while the enemy is distracted or is unaware of
your presence. If you cannot, you can still deploy the machine gun quicklyby
pressing your secondary fire button and then holding down your primary fire
button. Familiarize yourself with the deployment time.
When you deploy, remember that you have a limited field of fire once
deployed. Be sure that you aim at the center of your desired field of fire when
you hit your secondary fire button. Also, be sure to learn the limits your field
of fire.
The machine gun is not useless while undeployed, either. If you stop, crouch,
and control the recoil, you can kill enemies at short range. With the MG42, it
may help to fire in bursts so that you can readjust your aim. It is possible to
lone wolf with a machine gun, if you are sneaky enough and the enemy team is
dumb enough, but remember that your accuracy decreases greatly with range.
Keep in mind that the machine guns can shoot through walls. If you know where
an enemy is behind a wall, kill him.
Reloading the machine gun takes about six seconds, during which time you are
vulnerable. You cannot undeploy in the middle of a reload, so you may want to
hide to reload. But if you do that, you will not be able to see the area you
were covering, so be prepared when you redeploy.