AI doesn't seem to care when you help its enemies
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Stardock Forums
One of the issues I've had with GalCiv 2 from the beginning is that pouring everything into diplomacy seems to make the game too easy. If I have enough then between tech trading at an advantage and the relations bonuses it's hard to be overcome unless the AI severely outproduces me.
Something I realized that contributes a lot is that the AI never seems to care when I give stuff to its enemies (particularly ships). Normally war might be a threat to a diplomacy player even when not involved (for example because a closely matched race could grow to levels where it would have a significant advantage), but if I can drag it out enough by giving ships and resources to the weaker race and rely on my extensive diplomacy ratings to compensate for the lower military rating, I can hurt both races' military enough that neither will be able to compete any time soon. Additionally, as starbases are destroyed by the war, I can move in with my own constructors and steal all the resources.
The AI seems pretty oblivious to this strategy. It doesn't seem to care at all that its war would likely be over if not for my interference, nor that I'm stealing its hard earned spoils out from under it. I think it would make diplomacy/alliance victories a lot more interesting and challenging if I had to balance trying to keep the other races from getting an advantage with them getting angry by interfering with their potential success.
Something I realized that contributes a lot is that the AI never seems to care when I give stuff to its enemies (particularly ships). Normally war might be a threat to a diplomacy player even when not involved (for example because a closely matched race could grow to levels where it would have a significant advantage), but if I can drag it out enough by giving ships and resources to the weaker race and rely on my extensive diplomacy ratings to compensate for the lower military rating, I can hurt both races' military enough that neither will be able to compete any time soon. Additionally, as starbases are destroyed by the war, I can move in with my own constructors and steal all the resources.
The AI seems pretty oblivious to this strategy. It doesn't seem to care at all that its war would likely be over if not for my interference, nor that I'm stealing its hard earned spoils out from under it. I think it would make diplomacy/alliance victories a lot more interesting and challenging if I had to balance trying to keep the other races from getting an advantage with them getting angry by interfering with their potential success.