Note: MGs fire in a cone, not a straight line; this is observable in the training grounds by watching adjacent components take damage even when you don't move your crosshairs. Depending on range some of your shots may miss because of the cone even when your crosshairs are directly on the target. For this reason MGs are basically terrible outside of knife-fighting range.
Getting into knife-fighting range is dangerous. To use MGs effectively you either need to be extremely fast (so you can get away quickly) or pushing with a group so that the necessary exposure time doesn't put you at a disadvantage. On open maps (e.g. Alpine), speed is not enough to get you in and out safely. In that case you have no option except to push with a group.
Edited by Shlkt, 14 October 2014 - 06:51 AM.