Last night I took a shot at a machine gunner exiting a building. Lucky for him I am terrible with bolt action rifles, and when he swung around to aim at me and squeezed the trigger while strafing to the left I was AWESTRUCK by how awesome he looked. Straight up Terminator style. I just stood there watching with my jaw at the floor, didn't even work the bolt, I just stood there and got mowed down (pressumably only knee-shots to further cement the T2 imagery).
I don't think there is anything seriously wrong with MG hip firing as it is, but it should be complemented with raised sights without using the bipods. Overall I would like to see weapons getting readied a little bit slower after moving, it would eliminate much of the superhuman run & gun. I'm not just talking MGs though, I'd like to see it applied to all weapons, so it is outside the scope of this thread.