I reloaded my spanish campaign, broke the alliance with france and that haven't attacked me for many years now, morocco attacked me again and was easily crushed though but everybody else has been rather quiet, some of them I appeased by giving them some of my european starting provinces which I was too lazy to babysit as they're isolated anyway.
I must say though, what surprised me is that some AI factions actually do go on a conquering spree now and become really powerful, Austria, Sweden and Prussia have all expanded quite a bit, now Prussia is expanding into Austrian territory which goes all the way down to Constantinople or whatever it's called in the game.
The bad side of this is that they are all engaged in neverending wars, I haven't seen a single peace treaty signed between AI factions and as I said earlier, at some point everybody will be at war with everybody else...
I'm still surprised my neighbor France hasn't declared war on me again, I wish they had kept the peace while we were still allied before I reloaded an old game.
Now if the expanding factions won't always be the same ones and the diplomacy gets fixed to be reasonable and AI factions make peace with one another, I will be kinda happy in the campaign map departement but diplomacy is still a big issue as the AI either refuses everything or wants loads of presents even if it's almost crushed and doesn't make peace with other AI factions either.
And then the random declarations of war, even from your close allies, they need to go, never to return, that would improve the game a lot as far as I'm concerned.