What, you mean in a lore sense? Meh. It's not that different from uncontrolled hipfiring in the previous game - without the modifications like Frictionless Materials X that broke the laws of thermodynamics.Also one thing that still bugs me since ME2, is the ammo system. It isn't that big of a problem, but it doesn't seem right how little heat the thermal clips can take before having to be ejected.
Besides, it was never clear how ME1 guns cooled themselves off anyway. I just chalked it up to "they didn't think this stupid idea through" and moved on.