[thejeff]

Well, the problem with relying on a list of games won to determine balance issues is that there are so many other factors - player skill, alliances, location and neighbors, size of game, simple luck, etc - that even blatantly more powerful nations don't always win and our sample size simply isn't large enough to be significant for anything but the most overpowered nations.
If one nation has won twice out of 20 games is it twice as powerful as a nation that has only won once? Or even twice as likely to win?