I have tried very hard to make this ship work, because it seems like it has great offensive potential, even rivaling the Conquest with its AAF and 2x large ballistic 2x large missile setup. Unfortunately, it is very much let down by its flux capacity, fragile hull and bad shield arc, and does not have the OP to mitigate these issues with hullmods.
For example, here is a setup that can defeat sim assault Radiant under AI control (the one with 4x Autopulse, Plasma and 4x Reaper). Give officer skills: elite Ordnance Expertise, Elite Missile Spec, Ballistic Mastery, Field Modulation, Target Analysis (elite if you can).
Note that it can win, does not always win. For example not intercepting a Reaper or getting its Storm Needler disabled will lead to death.
However, I tried sending a fleet of 6 of these ships, and my special Ordo Farming Doom and Paragon to fight a Remnant Ordo with 3x Radiant using the usual tactics of defend order on Paragon. They just get slaughtered by the Radiants in fleet combat - they actually deal good damage but are extremely vulnerable to getting flanked by mobile opponents.
I think this ship deserves a buff. The Pirates deserve a capital that strikes fear into the player. Basically just give it more OP or better flux stats and it is fine.