Yeah, the Destroyer is quite fun. Just be careful though, a Flagship will outmeat/out damage you up close.
I've found the ECM jam to be quite useful for doing things like setting up Assassins and as a first in usage. It affects the entire sector and all enemies. For things like a Gas Fight, you can easily be first in, start firing, fire the jammer. Then have your team come in. If enemies don't appear on sensors, there is also no audio queue that someone else showed up for the fight.