I find pleasing the post-patch added AI naval agressiveness however, it frequently borders with extreme silliness... For example, playing as English I get frequently attacked by my former allies' Spanish and Portuguese navies (we have no common borders except the sea). The attacks come in both forms: port blockades and landings, which I consistenly repel. This alone would be alright (there are even historical precedents for Spanish agression northwards) with me.

But then... if I approach same Spanish or Portuguese with a diplomat in the same turn they attack, they always seem to be very willing to negotiate for peace and even pay for it (dearly)... It seemed as if their fleets were somehow "out of control" and carrying their attacks against the will of their royal superiors... So, is it just that the AI has been set to randomly invade by sea no matter what? Needless to say, it does not help the AI factions to develop to their full potential.