Alright, went and unlocked Sieges to see how they'd do, and I'm too scared to use them.
In my current game I took the Neinzul Viral Enthusiast and Neinzul Cluster Bomber. Each has their own cluster structure which spawns a swarm of younglings when you get close.
This causes you to overlook the fact that they are also armed. The Swarmer Structure Mk II has an 83000 range, 32000 attack on a 2 second reload. Bomber Cluster Mk II's have the same, except a 200000 attack. They also get bonuses against starships. They were doing at least 150000 damage a shot to my light starships and they've account for my losses of 10 flagships and 20 light starships so far. I don't want to think about what that would do to my Sieges.
(My saturday morning log of my game is
here.Going to give them a trial by fire here anyway, I've killed the Cluster structures in this next system although most of the rest is still up.
D.