Well the random map generator was supposed to generate random yet equal maps. For instance, if you didn't have close access to many planets, you might instead get many nearby galactic resources. If you were for instance, inconvenienced by having many civilizations nearby, then they was likely something that would balance things out for you.
I should point out that if you were not happy with random maps, you could always use a pre-designed map, either made by the devs or made by yourself.
