So i was able to play for a while, couldn't test some things as much as i wanted unfortunately.
Anyway, i think the Decurion and Centurion are a bit too strong currently, especially the Decurion.
The two medium universals make it good for every roles. It's also the fastest II ship with its system and II desperately need it for chasing scenarios if you lack fighters.
The Basileus seems to have trouble working right. It's extremely vulnerable so its obvious role would be long range fire support, unfortunately a twin ballista Decurion seems better at this role. The Basi still have its use, a reaper loaded Basileus with a ion cannon can sneak in the back of capital ship and unleash hell, that's only a trick that the player and not the AI can perform though. You can also fit it with Tornadoes missiles, very brutal in the hand of the player but still kinda meh with the AI.
The fast missile rack system doesn't work very well with the small missiles either. Perhaps i should try to make a small ballista weapon? Then it would finally be a very handy LRM support. For now the Decurion seems better at this job to me.
I wasn't able to find a place in my fleet for the Invictus. It may be tough as nail but its weak flux stats make it very underwhelming. Not fast enough to intercept, not enough flux for dueling other frigates, i don't really know how it work. The best i was able to get was to fit it with 2 autocannons, 2 vulcans, 2 pulsars and a harpoon, still, have trouble flying it. To me, the numerous small mounts make it supposed to go brawling other ships at close range but the flux limitations make it hard.
Anyway, the Decurion is the grand winner of the frigates, i think it should definitely be nerfed, flux dissipation maybe?
For the destroyers, the Praetorian is pretty nice but the Centurion does everything better, the 2 medium missiles help. The Centurion is also waaaay tankier and have also almost twice as much flux capacity, it may be a bit more expensive to maintain but it still seems much better than its little brother. For now my winning strategy is to spam Centurion, you have enough guns and missiles to drown anything under your firepower.
Perhaps nerfing a bit the Centurion speed and the flux?
Didn't tried much the Princeps, maybe when i'll build a carrier based fleet.
For the cruisers, honestly i barely tried the Sebastos, it's cheaper though so it might really shine in Uomoz mod where supplies are very important.
The Dictator works like a Dominator, only with light guns. Very fun as a rocket variant but really shine when fitted with sledge guns. I wasn't using it that much as the Centurion was offering a very similar loadout but with 1 more burn speed. If the Centurion is nerfed, maybe the Dictator will now really be a very interesting choice.
I managed to grab a Dominus but as i wasn't fielding fighters, i wasn't using it to its full extent. Definitely not bad but i should try with a hybrid fighter/cruiser fleet.
No other capital ships available for the moment, only the Olympus A but unfortunately i lost it after a few battle so i don't really know how well it fared.
I'll stick with my artillery based fleet until i can get my hands on a Caesar to try it. After this, maybe a missile or carrier fleet.