:) Well, they aren't that bad of a unit. They have some use, but it's indirect. For example, after transforming them into archers, you can add some neutral monster to your army – a slot is free. And also, they generate money. It would be better if they brought in some random income per day – 1 or 2. But in general, they help in a prolonged war. They just sit in the castle, accumulating money... The main thing is not to lose a decisive battle against a Necromancer :)

Although I agree, it's not a very good unit. Especially the appearance.