![Posted Image](http://www.geocities.ws/keninmansfield/MW4repairbay.jpg)
Risk v Reward on these things was pretty well done in MW4. You had to power down and stay still for a long while, during which you could be destroyed with no defenses. It would not replace destroyed components, only repair stuff that was still present, and would also resupply ammo. In order to use them for repair, you basically need a guard, who is automatically -1 from the attack forces.
It would also add an additional layer of strategy to the maps. Not only repair your own damage, but you could capture or destroy the enemy's repair bay and lock them out. Less arena TDM and more objective play.
It also provides a hook for territory control, capturing the enemy repair bays and ammo dumps.