Personally, I kind of dig some aspects of this "Necromancer" class depicted in this Reddit post. Healing your raid by stealing life from enemies is a great way of describing a "fistweaving style" way of healing. Tanking using an armored minion also intrigues me... although I'd rather see BM Hunters able to do that.
The big problem with the Necromancer concept is that the concept itself is too close to both DKs and Warlocks.