Minigun

Overview
The Minigun is a weapon that will be unlocked when entering the game. It is the default, starter weapon. It does low damage but when upgraded has high fire rate; however unupgraded it is a poor weapon. On the Mobile version it is called "Machine gun"; see Minigun (mobile version).
 * Fire Rate:   8 / 10 (fully upgraded)
 * Damage:    1 / 10
 * D. Output:  5 / 10 (fully upgraded)
 * Ammo:       Unlimited
 * Range:       5 / 10
 * Accuracy:   4 / 10

Ways to use
Since the Minigun is a simple weapon, and you must fire constantly to deal damage, there is only really 1 way to use it; keep your distance and fire none-stop. Don't try fleeing or peek-a-booing, you won't have the range or line of sight to deal much damage.

You can get some success with baiting, but due to the average at best damage, unlocking a new turret is a better choice than sticking with minigun.

It does have 1 other use, and that's for destroying crates, gates or weaker enemies. The mediocre damage output won't hinder you as much for this purpose, and the infinite ammo makes it free to do.

Conclusion
The Minigun is a fair weapon to begin with, but as you progress becomes less useful and really should only be used to destroy crates and such or as a last backup.Пулемёт