I've heard that one branch of the military used to do a demonstration to their trainees.
They would pick the least apt/coordinated trainee and take him aside for some basic marksmanship training.
Then they would bring the whole group to the firing line with some human sized targets at around 100yards.
They would have the group fire at the targets with their issue rifles with the special trainee going last.
Inevitably, the rest of the group would fire full auto, often unaimed, from the hip, while the trainee would fire aimed semi-auto shots.
It was not uncommon for the special trainee to make more hits than the entire rest of the group.
Full auto is fun, it's useful in very limited circumstances, but not in general.