You dont have to show me how to use Nightmares against NPC swarm, i was first to figure that out loooong ago on my Valor lol !
Anyway, it only work on some ships , which have at least 2 heavy slots on same side of ship , so not all ships can use it , and you DO need to fire missiles at nearly perfect 90 degree angle .
So my point stays , you need SOME skill and precise aiming.