Diplomacy AI definately needs to at least have an option (although there is a mod for this already) to make them not get pissed over peaceful victory advancement. Starting a blitzkrieg because you build a spaceship part or try to build up culture is kind of ******ed and makes any alliances meaningless unless you dont go for the win.
But lets not pretend Civ4 diplomacy was better. Actually I think overall it was even more simplistic, although less broken...
But lets not pretend Civ4 diplomacy was better. Actually I think overall it was even more simplistic, although less broken...