We all know, human weapons are too weak. Pulse rifle projectiles are too slow, the only guns really usable seem to be rifle, flamethrower, saw, shotgun and lucifer cannon, which is also hard to wield, but very effective.
But what about that chaingun?
It would make a formidable weapon, extreme rate of firing, even if the bullets remain that weak, but you simply cannot use this gun: I often made the experience that I am standing in front of even some weaker aliens, in point blank range, it should be like shooting a fish in the barrel, but no, no effect. Dammit, I couldn't even kill dretches with that gun, where a rifle in the same place would have killed them twice at least.
So what's up with that gun? Why that terrible inaccuracy?
Human weapons suck in general, but the chaingun beats'em all, in that respect.