Quote Originally Posted by Animeniax
People were really upset with Dead Space 3's use of universal ammo, but the alternative was the very limited ammo for certain weapons in the first two games so people just used the same few guns that had plentiful ammo.
Then that's a balancing issue. The weapons ideally should have their available ammo balanced such that a high-output weapon has low ammo around, while a low-damage gun has plenty of ammo to go around.