Starbases are not OFFENSIVE enough. They have enough hull points, but they don't do enough damage, even when upgraded. They should also have things like flak and culture upgrades. All starbases should move as well. Vasari starbases make EXCELLENT minesweepers with fully upgraded hull points.
Mines are OVERPOWERED. They should not flicker between invulnerable and vulnerable. If you have a scout in range, the mines should be vulnerable, period. Also, there should be time limits and quantity limits of mines within grav wells. The cost/damage ratio for mines is insane and completely unbalanced.
There is not an effective COUNTER to mines. According to the ideas of coutners, there should be a cost effective counter that you can build for mines. Right now, there isn't. One mine laying ship costs less than a scout and a flak frigate.
The kostura cannon rocks and all, but I think it also destroys mines because the damage per unit is more than the HP of a mine. If this is true, then Vasari not only have the best mines, and best starbase, but also best counter to mines. The vasari race is so overpowered in the beta that I can't imagine playing any other race.