It's insurance on a few specific missiles with secondary effects that matter more than the damage. But it doesn't help anything that already significantly boosts its accuracy(like Proton torps.) Personally I think adding to the cost of ordnance doesn't help make it better or more strategically reliable.
Except ordnance cost so many points that if a proton torpedo wiffs that is points down the drain. Letting you re-try your best attack if you have bad luck is pretty good. Though like all upgrades, it isn't a no-brainer. I don't think it is a good idea on every ship. I don't think I would take it on a X-wing or B-wing since their primary attack is already so good. But at 1 point on a Y-wing, or a TIE Bomber I think it still has place to help things like concussion missiles or proton torpedos
Edited by Hrathen