So, after playing the game quite a lot since the last DLC/Patch I feel like it is WAY to easy for Grimgor in particular to snow ball in particular as an AI. In almost every campaign I have played he confederate all the orcs very early then waaaaghs until the end of days throwing massive armies constantly at anyone unlucky enough to be in his way. So maybe some changes I think that would help bring this down a little bit would be
1) The Greenskins should only be able to confederate in one way not two. (the Norscan way) This would help contain Grimgor a bit from getting too powerful too soon
2) Campaign waaaaaaghs need some sort of check put on them. Either it should take a lot longer to get a waaaaagh, or fightiness should be re introduced as a way to keep the player moving to gain his waaaagggh points. (also whats with the AI getting lords in their waaaaghh armies? Even legendary lords sometimes?)
3) And finally as a side note to all of this, Grom should always start in Massif Oracal. As he has literally noooooooo chance starting on Ulthuan ever and seems sort of pointless to be there. Also letting Eltharion have his holdings in the badlands as well when he is an AI might help control Grimgor as well.
Anyway, these are just my thoughts based on what I personally have experienced so far. I hope this does get addressed though as some campaigns suffer quite badly because of this (Imrik, any Dawi, Snikch so on)