It really is. I was playing for a Science Victory with Siam and I won. But the whole game, I had 2 weaker Civs declare war on me. The first one was Suleiman, who I didn't really have a problem with; since I highly out teched him. For the most part, I let my city state ally deal with him. But in the middle of the game, Montezuma, declares war on me. Now, at this point, I highly out tech him. I'm using Artillery, while he's using Pikemen and Spearmen. My city state allies and I keep beating him. Yet, the warmonger AI doesn't seem to know when to give up. I'm beating him yet, he keeps demanding all my resources and refuses a Peace Treaty. So basically from that point on, it was nothing but constant war with Montezuma. All the way until I built the last spaceship part. On another game, I was playing for a OCC cultural victory with Egypt. Things are all going well and I'm building every wonder. Until warmonger AI Greece declares war on me. So anyway, I got a couple City States to declare war on him. So as usual, the city states are kicking Alexander's butt. But for some reason, even though Alexander is losing, he keeps demanding all my resources. I seriously just quit this game out of boredom. It's just boring watching your city state allies fighting off Alexander the whole game. Main point? The AI needs to know when to give up. A human player would not continue to go to war, when all his units are dying. I personally think the aggressive AI is intentional. I think it's to slow you down when you're doing better than the AI.