This has to be high priority fix

[Booyja]

Campaign AI taking over the whole map, leaving the whole map conquered and nothing to do anymore.
I can live with bugged quests, i can avoid them, but this ends the game pretty early.

 

[Smithers945]

It's mostly to do with vassals not recruiting new troops after being defeated, because they get captured by looters and other such thugs. That and possibly the Empire has access to high tier armour whereas the majority of the factions do not.