I honestly thought when I saw the title that you wanted to actually pilot a torpedo. You all thought it to confess!
A torpedo/destroyer is an interesting idea, it will take skill to fly and hit effectively without suicidal tendencies from shockwaves...
Having no anti-fighter capability is a bit harsh, so one skilled pilot can take it down. Not very friendly or smart from a military perspective.
This thing in theory would decimate capital fleets, but if you take it a knocking in Gamma, bye bye.
This ship is just going to be a magnet for fire and a waste of money in-game I would say though. With little or no interest since it kills them too quick.