The diplomacy AI isn't as bad as you make it out to be and there is a good guide on diplomacy. Think how much of an improvement it has been over MTW. It may not be perfect but its so much better, so give CA some credit.

As for the other bugs such as squalor and protectorate bug, Gerome has said they are fixing it in a patch. CA know about it and are fixing it, so complaining about it, it won't help