Hyborem always seems to suck in all of the games I've played. Maybe the AI doesn't know how to handle him since he plays so differently... or maybe it's just that he starts off a bit too late. In fact, Basium doesn't generally end up too well off, either (though generally better than Hyborem if I can recall correctly).
I'm in a game right now and the Sidar seem to be doing fairly well... not sure if they usually do, though (this is the first game I've seen them in "Shadow"). Capria seems to do at least decently well generally, too. Or, at least, in the last two games I've played she has been mid to high tier on the score chart. I actually had a game where the evil jester (the male one) was the highest on the score chart by far... but I've only had him in one game, so I don't know how much consistency there is to that. In that same game the Llorians... I think his name was Ulric... was pretty high up in the scores, too, at second place. Again, not sure of any consistency on that one.