In anciant galaxies each system has about a 75% chance of being devoid of planets (a black hole, nebula, or asteroid field). I like them in hotseat games, but I aoid them against the AI because the poor thing can't ever seemt get more than 3 systems because it can't handle the increased range between inhabitable systems. You keep running into these hoards of colony ships out of supply and getting swallowed by blackholes totally choaking the AI's economy. Galactic Edge maps are similar, but they have many more habitalbe systems. Still both types seriously hurt the AI's performance.
I find the AI works best in grid and mid-life quadrants.
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