Voted for an improved battle-AI although a sane campmap-AI is second on my list.
The whole reason I play this game, and has since Shogun was released, is the battles. In S I thought WoW! this is great, the AI is acting almost human and is making pretty sane strategical decisions on the battlefield. Through MTW, RTW and M2 this has deterioated to a fragment of its former glory, sad to say.
In S it was easier: take it all! Maybee that´s why its so good and easy. The AI is more in sync with a conquer all mentality. In M2 nowdays there is so many ways I can play this game and still win but the AI is just making worse decisions than ever:
Why send one ship to attack my empire and not have the troops or even the intentions to follow up with some attempt of an invasion or landwarfare?
Why send priest/ imams to foreign lands when your own provinces is howering between 30-70%?
Why send spies abroad when his own cities are littered with foreign spies that incites one rebellion after another?
Why declare war on an empire that outnumbers you, by any criteria, by 10:1?
Why do the AI expand in a stright line rather spiraling outwards from its centre?
Why do the AI cross a bridge when I´m attacking them?
Why does he move down from a hilltop just because I cirled around his flanks?
etc etc etc

PS. I´m actually afraid what CA is going to come up with for the next title.