
I agree with bricks. Minion management is annoying. Your minions are too dumb to navigate corridors without getting stuck somewhere and dying. For example, the Thaloren city is crowded with npcs and narrow roads, so it makes shopping there a hassle (though the city looks very nice). The aura's range might be too restrictive. There's already a limit to the # of minions you have have around. And they tend to get themselves killed quite often (by traps, other minions, etc..).
Anyway, nearly all necromancer talents have a long cooldown, so you'll need a source of metaflow for emergencies. Especially, since Curse of the Meek is unreliable as minion fuel.
Best minions: Archers and ghouls. Archers are like moving turrets and high level ghouls can use retch (your only source of minion healing).
Worse minions: Skeleton mages and armored skeleton warriors. Constant friendly fire. Thankfully, at high levels most minions get bone shields. And probably resurrect/heal themselves, I forgot.