you now , my current campaign as the danish is quite a rare one I think. I've seen quite a lot of nations do things they normally don't.Portugal and Spain have invaded France.Portugal also landed on the english isle and are in war with scotland.Spain (!) took dublin,ajacio,cagliari and a moorish province.Milan is in war with sicily and took their capital (Naples).
In the future,i'd like to see the A.I do more of these things.And I think the A.I making huge empires would be fun to see too.Also, there are a couple of A.I factions who look like they are on retirement.They just don't do anything Examples are The Turks ( never saw them invade Greece,they just stick with their provinces in turkey),the Egyptians (they conquer a lot , but i have never see them carve a path in europe,nor attack the turks or whatsoever),the Moors (only fighting Spain and Portugal) and Russia ( they never invade Europe :s )
This makes me sad, I want a different game each time I play a campaign, say once the egyptians, once the French conquering a huge empire.