The only torpedo worth taking is flechette, because it does not have to be one-shot. All others, the plasma torpedo included add a marginal bonus compared to beam weapons and that for just one shot. Simply not worth it, not even two points. There is a case for missiles with area effect as they may force the opponent into open formation, but even this advantage is highly situational.
Not only that, but also a one trick pony that has ZERO effect on the Two Ship meta these days. FFS, release the Falcon killing missiles FFG.