I can understand OP's fustration here. Missile ships are already so strong in this game. Two volleys of missiles is enough to destroy a capitol ship, by the time the capitol ship gets in firing range of the missile ships.
What makes the Vasiri missile ships more overpowered than the other races is that the 50% shield penetration which is absurd in my opinion. My advent capitol ships die even though my shields aren't even down less than 40% shields remaining. This is where have some criticism of the removal of shield mitigation feature that existed in Rebellion. Why they took it out of the game for Sins 2, I don't understand.
Because with shield damage mitigation, say for example, an Advent with the strongest shields in the game had a shield mitigation of around 75% damage mitigation which meant that only 25% of the weapons fire was damaging shields which also affected the Vasari's phase shield penetration weapons as well. Meaning that Advent ships would still sustain damage from phase weapons getting through the shields, but it was a lot less damage and it was survivable until the shields would go down to 0%.
It's kinda silly that my ships are dying with 40-60% shields remaining.
then we need to nerf the Crusaders as well. Those destroy anything in seconds, and are tanky AF with some guardians around especially.
offtopic. I find it really unsatisfying, that your fully upgraded starbases just explode in under 60 seconds, when a group of 30-40 crusaders arrive there is really no way to save it. You should have at least 200 kanraks to achieve the same level of destruction. I guess the starbases should have durability of more than 1000 (just a suggestion). And same for all orbital structures, their durability needs to be pumped up imo
I don't think crusaders need to be nerfed. For starters, Crusaders are cruisers, Kanraks are frigates. Huge difference. 40 Crusaders are enough to take on a titan. Would a starbase fare any better? There are counters for crusaders though. Huge bomber squadron spam and kite your carriers around the gravity well so the crusaders will never be in firing range. Corvette spam would also take care of those. Or you could use "Red button" which would wipe out the crusaders. If you have a decent economy you could get a starbase back up and running in no time.
The amount you invest in building and fully upgrading a starbase, the other opponent will have spent the same amount of resources building 40 Crusaders. So it's not an unreasonable expectation that your starbase dies or you destroy the 40 cruisers. It's just a matter of strategy.