Did just capture a spoiler vessel though! The battle was pretty intense. They had high levels of ECM and I had to get within 18mkm of their position with my fighters. I managed to sneak in on lower power to get my missiles away only to find that that was within their AMM range! Lost three quarters of my fighters but still somehow managed to rescue all the life pods and limp back to the carrier.
I closed in with the rest of the fleet as I had a couple of missile cruisers with much longer range, however they weren't able to meaningfully break through their AMM defense before I ran out of my long range missiles. Hoping that their magazines wouldn't last much longer, I brought the fleet even closer to engage with shorter range missiles even though this brought me within their AMM envelope. Unfortunately, my area defense couldn't stand up to the large amounts of AMM's being fired. They slowly sandpapered my carrier while I desperately launched everything I had. Their focus on the carrier, however, proved to be their undoing. With their AMM's occupied I was able to score large numbers of hits with my own much more powerful missiles. For awhile I was extremely concerned about losing my carrier, the armor belt was breached in numerous spots and I was starting to lose internal components, but eventually I was able to take out all but their smallest 10k ton ship before I ran out of missiles.
My beam area defense was enough to drain the magazines of the final vessel, so I launched a few meson interceptors to see if I could cripple it enough to board. Took quite a bit of patience, not to mention dodging a few ramming attempts, but eventually the vessel slowed to 742km/s and the marines did the rest!
So now I'm the proud owner of a missile jump destroyer. The engine tech is actually one level below mine but their ECM and ECCM are two levels higher, although they were both damaged by the mesons. I guess I want to repair him back at a shipyard and then scrap so I can recover the ECM and disassemble it? Also, the class design summary isn't appearing in the intelligence window which is somewhat disappointing. Even copying and pasting from the class design window doesn't seem to get it to stick, I suppose that only gets populated by espionage?