In the games that I play, the primary nuisance races are either the Drath or the Altarians. The Torians are usually harmless. When playing a game with all civs active, it appears that the Dregin and Yor tend to get stomped out early by the good races. who in turn re-enforce one another, at least indirectly.
The races that appear to do the worst in my games are the Dregin, the Yor, and the Iconians. The Torians are simply average nuisances.
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