Soldato
There are some major problems with the game, namely the vortex mechanic being a bit rubbish, intervention armies being useless or unfair, battle AI being crap, and AI army compositions being silly to name some of the biggest. If you read the official forums you will get details.
Vortex mechanic, doesn't matter you can bypass it. That includes intervention armies, depends what they hit. Skaven are easier to beat to with 10,000 gold army, the rest are tougher.
Battle AI have you set it up to VH difficulty on battle AI? (thats a hidden slider behind the button on the screen you set up the campaign difficulty)
AI army compositions, yes is a known issue and has to do with the "power weight" of the units, and the AI ignores the templates. But that easy to fix.
However AI is generally vastly improved over before, and especially over TWW1.