How do you miss with a minigun.... I mean not to troll, but that seems a little hard.
I don't, but a big reason players go for more bullets over stronger bullets is because they can't hit.
As a light my options are SMG, LR, MP, or Pistol. If more bullets was better then there would be no use for a regular pistol when I could take a machine pistol.
If the bullet damage from a pistol is the same or better than an SMG/MP then I don't need an SMG/MP unless I can't hit with the pistol. Don't get me wrong, automatic weapons obviously have their place, but it doesn't make them better weapons than pistols. It's all about the situation and the shootist.