According to ZOS necro should have the most debuffs to debuff his opponents, but at the moment necro doesn't look like he can really debuff anyone.
Let him have a minimum number of useful buffs for himself, but debuffs should be the most among all classes
What's worth changing:
Bone Armor - Change Minor Resolve to something else since Vigor already has Minor Resolve, for example Minor Vitality it will be useful for pve and pvp
Skeletal Mage - Remove Major Brutality and Sorcery and add Major Brutality and Sorcery passive if necromancer absorbs corpses for 10 sec, this will be balanced as Restoring Tether lasts 12 sec and Shocking Siphon 20 sec. Instead, give Minor Prophecy to Skeletal Mage. This will be good in conjunction with Shocking Siphon which will give Major Prophecy
At this point what's worth changing it for necro to start becoming what ZOS intended it to be.
With the other skills that were touched on in up43 it is not yet clear if they will be useful in certain situations
Offer your versions of what the necromancer is missing and how you would change it, we need to get it to ZOS