So, if you've got an opponent that relies largely on missiles, would it be worth making a commercial ship with nothing but engines and a lot of CIWS to bleed their ammo supply? Toss a couple of those into their system, and let them through missiles at it until they run dry, but you don't have to worry about maintenance...
Just thinking about how that might work... I really hate maintenance. (But not enough to turn it off... heh.)