In the past three games, I've had to deal with a monster Drengin. You know, the type that quickly has four times the military rating of his closest competitor? The kind that decides the gobble up its neighbour simply because they smell funny?
In my last game I managed to catch them early and prevent them from eating the Torians. Their attention was redirected toward me and they sent fleet after fleet into my solid defense. After a while, they got tired of that and sued for peace, but only after their military rating was halved. That game was relatively balanced, for most of the game. No one except for the minors fell until much later in the game.
In the previous game, however, the Drengin were quite monstrous. After the colonisation phase, they were as big as their Torian neighbours in terms of influence, so at first I didn't worry. To be honest, I was more worried about the Torians. Soon, however, the Drengin declared war and started gobbling up Torian worlds. I was on the opposite side of the map and between us was a massive expanse of empty space, so there was really nothing I could do other than trade and give some tech to the Torians. I also had my hands full dealing with the Yor, who honestly weren't too much trouble, but I was still on the defense, due to a lack of good ships.
By the time I started taking Yor worlds, the Torians were gone, having surrendured to the Altarians. Apparently, the Drengin didn't appreciate their prey disappearing, so they started munching on the Altarians. Once that was done, the Drengin controlled half the galaxy and their military rating was at least 8 times their nearest competitor: me. It wasn't all fluff, either. I had finally decided to try and do something about them, but my best ships were very easily outclassed. They had a tech advantage and they were using it well. . .
Needless to say the game ended painfully. I couldn't hold out against them. They had a powerful economy and industry backing them up, while I had an alliance with the Thalans. Heh.