Having been playing through this campaign, there seems to be a lot of problems with balancing difficulty, where it can go from easy to suicide mission within minutes, and vice versa, especially on levels where you have a massive army, but near-zero co-ordination capabilities without a barracks or call to arms spells on hand. Another major problem is that it relies significantly on random chance, like in The Dark Descent, where you pray to the dark gods that your imp doesn't stumble on a poison gas trap. This isn't even getting into the glitches that render it literally unplayable at times.