Personally, I enjoy playing as Necromancers! It's great when new units join your army after each battle (even if they are just skeletons). And if you collect the "King of the Undead's Cloak," you can build a decent army without even returning to your Castle! Plus, their magic is quite powerful! ;)
Yeah, the cloak is definitely good, but it's rare to get it. And Necropolis is the weakest faction. Bone dragons were a disappointment.
