Playing as medium on the campaigns I have on the go. Diplomacy seems to be reasonably ok although I'm in a recurring cycle of war, beating the other side up, pope getting involved, ceasefire and then the other side then has a go at me again. I tend to be fairly defensive in my games so it could be a consequence of that really.

For battles I'm tending to be a bit bad and using auto resolve a little too much. For the ones I am fighting then the ai is certainly being a lot more intelligent about things with it drawing me into traps and attempting ambushes.