What I want from a grand strategy game:
In service of player, I don't want games to give handicaps to my opponents.
Since it's a single player game, I don't want the game's agents to play their roles for my enjoyment.
I want a selfish AI just as me. The player.
Giving personalities to AI is good thing but in the end AI shouldn't "live" its role to fullest. It's first priority should always be "alive" Just like any living being.
AI personality modifiers should only weight actions of an AI to a degree but shouldn't lead to its demise.