I noticed that when they showed the Concord clip where you are using the Power Armor and the mini gun, the mini gun's barrels were glowing red.
I'm wondering if they are going to have over heating in Fallout 4 or were the cherry red mini gun barrels just a visual effect.
I liked the idea of weapon condition if for nothing else it kept you from getting rich from selling the firearms of a raider gang you wiped out.
It also let you get and use advance weapons while keeping them from being too powerful at least until you got them fully repaired.
But given a choice between overheating and weapon condition, I think overheating adds more to the game.
Overheating makes the combat more exciting.
Course part of the way the over heating mods worked was over heating the weapon caused it to wear out faster.