Made an account to give some feedback from my latest playthrough where I used pretty much only O.R.A. ships, minus utility ships.
#1 most important thing:
QoL Pack's Omni Shield Assist. Use this. Abuse it. It was my best friend. Being able to pin your shield in a direction, or at a certain target, made controlling these bricky lads truly feel fantastic to control.
In the early game, moving up from a Bliss to a Harmony felt fun. Weird playstyle to get used to, but fun none the less. I found the AI generally suffered if you didn't babysit their orders to keep them in a strict line due to their dependency on one another.
There are three main things I'll go over to hopefully not turn this into an essay going over literally everything I tried.
Cruisers:
Cruisers primarily consisted of paired Felicities and Beatitudes. The Felicity offered fantastic coverage for the Beatitude's advance, which in response offered valuable flanking coverage from their 'rear' broadside during a fight. These two were best of friends for all of mid and late game.
The Felicity could probably lose a flight decks and I would still make good use of them. Very potent support so long as they have something to run interference. Helpless on their own, but very fitting for their ability, especially when I strapped on some long range suppression missiles. Despite the capital carrier boasting double their flight decks, I never had nearly as much luck using it as I did these wonderful guys.
Beatitude by far outperformed both the Revelation and Elevation classes in my experience. Incredible coverage with 8 Medium slots just can't be beat, though this may be due to the power of a constant Eschewal Projector broadside.
Capital ships:
The Enlightenment a monster of a ship. It's ability to rapidly turn means I get to effectively double dip armor values. Probably the most fun capital ship I've ever flown. Against many fleets, this thing could quite literally fly into the middle of the enemy fleet, and carve it in two via broadsiding both sides at once.
What really made me feel this thing's true power was going full hog ham and Shield Stunting it, and building it for pure Armor. No longer having to truly worry about Flux, or rather, Flux being purely a value for the burst firing of my weapons, allowed me to strap some truly energy hungry weapons onto this thing that allowed it to just go to town. I truly have never had a more fun end game than with this ship build. This thing managed to solo the late game [REDACTED] fights.
Never used the Discernment, two Felicity by far outperformed it, and between this and the Enlightenment it was no question.
Weapons:
I feel like each one of the Large Weapons are... quite bad compared to non-faction options. Excluding the Incantation Horn, which felt effective enough. Invocation Launcher has it's job done just as well by even a single Eschewal Projector, and that's not even factoring in that it can friendly fire. The Calling Scatterer's damage never truly felt impactful, nor was it's PD effect ever noticed. The slow movement speed didn't help matters.
The Sempiternal Repeater lived up to it's note of being a niche weapon, in that I never found a real use for it. A broadside of Eschewal Projectors that landed even a single hit on fast moving hostile ships spelled their death often enough that it acted as an equally effective deterrent, while retaining its effectiveness against larger targets due to being fired throughout the battle.
Speaking of, the Eschewal Projector is the nastiest weapon I have ever had the joy of using. They remained effective against targets of any size at all periods of the game and outshined the rest of the faction's arsenal by a wide margin in the mid game, before the Enlightenment stole the show.