I have been playing WH2 and Grimhamer since they went out both and, a problema I normally see is that the AI have a los of spam armies of Gold Tier IV Units without having to sweat for them at the early-mid campaign (Specially Greenskins and Skavens).

I don't know but for me is so outstanding having 1 good army and then AI come to you with 3 full stacks of Immortals.