In this case im not talking about later-early game or midgame. Im talking about teching into 2 Wep labs right off the bat(this is Quickstart btw) and pushing a cap, support fleet and a Colony Frig into my 2nd-3rd world or even slppping past to my homeworld and planting it there. No time really for defenses while I expand to my 3rd world, one person slipped a SB into my homeworld with 4 assailants and his cap + started streaming carriers at me once it had built like wtf how do u defend against that lol. Guess its all about stoppign what your doing and trying to hit it before it gets ina position to be built.
SB aren't cheap, so you should have some ships of your own to deal with the SB while it is building. The real trouble is when someone is being fed by allies to rush you with Starbases when you barely have any ships. I find that to be a bummer.