The current ability set for Necromancy kinda sucks. The passive isn't that bad. Yeah, perma CC is a thing that exists, but outside of Arena it probably won't happen to you very much, as most enemies in the campaign so far don't have much in the way of CC (except Aeromancers; always kill those guys first if they're around). Overall, Necromancy's probably not worth investing in.
There are a few good skills in necromancy right now... and a few bad ones... >_>. So I wouldn't write it out entirely (heck the Chains move is still amazing! and Decaying touch is absolutely deadly if you know what your doing)
But currently Necromancy has 0-ability to stand up on its own. It has only one damaging move (now that blood rain doesn't cause bleed) and it does low damage and combos somewhat poorly into contamination, a move you will often not do.
It is only useful in combination with other moves and abilities... and frankly not TOO TOO useful for Wizards... Comboed with Scoundrels is the way to go.
