The Advent Stabase Meteor shower does 600 dmg per ship to all ships in range. This ability should be extrem powerfull. But it does not make hull damage like Crazie_guy already said.
At the moment the Advent Starbase is a dead duck.The range of it's weapons is to short to fire back against a long range attack. You don't even need the anti-Starbase ships to kill it. The only long range weapon is the meteor shower.
The vasari one works better and the Tech one seem to work really stable. There is much to do for the devs.
By the way, does anyone know if there will be dmg upgrades fore the psionic surge weapon and the disintegration weapon? Cause the Tech can upgrades the firepower of all the weapons in their starbase. Advant and Vasari can only upgrade two of the weapons.