I think that there is no definition of a good base, unless someone wants to prove me wrong. There will always be a weak spot and it is up to the players to make up for it. I mean if everything was impenetrable, then there would be no point to this game, which is to kill off the enemies base while killing off enemies. Even in the red room in niveus, even if humans do occupy it, bunch of adv goons could snipe everything and tyrants can be back up, especially in SD. I guess there are good strategies and bad strategies, but no strategy was made perfect