https://www.youtube.com/watch?v=Ilhwqnj5jG4
From “Saving Private Ryan”. American soldiers facing full automatic fire from German MG-42’s.
Yes full auto is effective.
It killed our Americans.
Great addition. The key to the effectiveness of that weapon was it was bolted down so it would stay in a field of fire which also limited it field of fire. However, if the field of fire was right where your enemy would be, such as landing on a beach below a hill...then yes, very effective.