Devil49, I actually think your "drawbacks" are huge pluses:
volume of fire blows stuff to bits, obscuring a target, and making a point-type weapon into an area-type weapon; and it uses a lot of ammunition...
And you forgot it sounds fantastic.
Blowing stuff to bits is why I like pulling the trigger, it rarely if ever obscures the target (that video was not using 4B1T), it is an area weapon that can be pointed extremely accurately with a danger close distance that makes cannon type weapons systems very jealous, and it's use of ammo just makes the noise better, the target fly apart more, and enables more accuracy!
Nothing like emptying an entire infantry sections' weapon load loose in 3.17 seconds from each of your two (or four if you are lucky enough to be Nick) minis!
All good.
