For me they always work. With my hunter I get to max my launcher once with ammo. With my Titan I can be wasteful if I want. Even if the drop thing somehow doesn't work for you, (it does work just people want MOAR), there is still the fact of picking up more ammo per box. With what I'm wearing my exodus plan can hold seven rockets so each ammo box I walk over gives me 4 rockets... Think about that for a moment