Of all the shortcomings of this AI, I think the lack of a decent (any?) siege AI irks me the most. The AI gets to have all the fun of defending a castle against a brutal onslaught, of using all 3 layers of defense in a citidel. The AI performs in a mediocre way on the battlefield, but at least it does a few things right.

I would love to defend a citidel against the swarming mongul hoard and face a real threat. That would make turtling more fun at least. As it is, castle-heavy factions (those with poor miltia troops) are boring in the mid-late game and its more of a logistical challenge than a military one: you know you can't lose a fortress/citidel with even a few decent troops in there.