The transports themselves are fine. It's the Turrets that need it.
Type 1: In my mind, the best. but they are slow, and have an even slower refire.
Type 2: The Illegitimate Bastard Child of the fighter Debs and Capital Pulses
Type 3 + House Variants: Pretty lack-luster.
Type 4: Even more lack-luster. They are supposed to be the Vengies of transport turrets but they have half the DPS. Also im pretty sure they are the most expensive. Logic.
Now I do realise this isn't the situation for everyone. But House transports have a hell of a time getting runs done without getting the 2MILLORDAI spiel.