First, let me make it clear that I don't think that the whole game is too easy. I think that the diplomacy part is.
I noticed that the AI accepts marriages too easily, even if it means the end of their house. Only once the AI refused a marriage proposal from me, and that was when I was King of Scotland and she was the Queen of Denmark, Norway, Sweden and Pommerania. Every other time, including one game where I managed to marry the queen of England when I was the damned duke of Britanny - my character was horrible, she hated BTW. Also, all my retarded/dwarven/ugly daughters never had a problem marrying the King of Whatnot.
Is it me or the AI simply doesn't give a damn about it's own House?
Re. female rulers accepting normal marriages, the "problem" is that the AI is designed to keep the game running in a fairly historical manner if left to its own devices, even if that means making decisions the player would never dream of. Female rulers generally did mean the end of their house IRL; cases like the de Lugisnans in Cyprus were very much the exception.
Originally Posted by PDR1987
Regent-Custodian of the Light
you're just lucky with the circumstances (the "political concerns" modifier is a sure yes), or using the wedding rings icon near the portrait that shows marriages that the ai will definitely accept