I like the Bannor, and like roleplaying. if you take into accoutn Basiliscs, courthouses, palace mana, and shrine mana, you already have -90% for city upkeep, and if you modded another 10% decrease for social order...
The main thing I dislike is their tire 3 priest's spell is worthless, since they already have a civic for increased happiness, and already have no worries about city upkeep. I wish their spell was more combat oriented to help them convert enemy units, and unyielding order became unyielding law for Law III.
I mean, why does the Empy have better combat priests then the order?