They really are, for me, a game breaker. Just- almost- finished a game against them.
It was just one war after another. Eventually I weakened them so much they ceded a city and another AI finished them off, but at that stage I had lost the game.
I had used so much time building walls, units and repairing pillaged tiles that the other players had far outstripped me in science and policies.
I guess if there was a positive, I never had a problem with spies stealing my technologies. They didn't waste their time.
It was just one war after another. Eventually I weakened them so much they ceded a city and another AI finished them off, but at that stage I had lost the game.
I had used so much time building walls, units and repairing pillaged tiles that the other players had far outstripped me in science and policies.
I guess if there was a positive, I never had a problem with spies stealing my technologies. They didn't waste their time.