^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Full auto increases testosterone, but that's about it. One well-placed, well-aimed round is better than all the "spray and pray" in the world. The Brits and the Argentines used the same rifle in the Falklands War. The Argentine version was full auto, the Brit version was semi. The Argentines didn't hit their targets as well (they caused fewer casualties), often ran out of ammunition prematurely and, bottom line... lost.
For awhile our own Army was putting three-round "burst limiters" on our own Soldiers' rifles. Firing lots of bullets may look good in a Rambo movie, but in the real world there is a lot of down time changing magazines, allowing the bad guys to maneuver against you. Firing full auto causes erratic movement of the barrel that cannot be fully compensated for by even the best muzzle brake. "One round, one hit" is MUCH preferablw to "100 rounds, no hits".
Full auto is definitely FUN... but that's about it. Now, in a crew served, belt fed weapon where fire can be sustained... well... THAT is a different story altogether.