If sticking with the usual space-opera model, the torpedoes should be devastating, particularly once shields are down.
However; in those shows, each ship has a limited number of shots (like Artemis),
but they are not readily replenished nor easily manufactured on the ship.
I am all for boosting a weapon's potency, but there must be a drawback to balance it.
Perhaps a torpedo could be fired "dumb"; replacing the guidance system with more payload and an impact trigger.
Not a guaranteed hit, but a more powerful punch when it lands.
This would reward the risky, long range shot as well as the in-your-face volley while discouraging the "park-and-shoot" tedium if the AI has access to dumb torpedoes as well.
"There is an old Celtic saying: "Coimhéad fearg fhear na foighde."
-Beware of the anger of a patient man.