Chicks don't dig that stuff.
On a more serious note, I personally think it's horrible item.
Not only bonuses are not worth it (I can enchant a much better item without any problem), but they are simply boring and have NOTHING to do with necromancy.
It should be renamed into a 'Poor Excuse For Conjurer's Amulet'.
Lot of their unique items and artifacts have crappy effects, and I really don't understand why they didn't get a little bit more creative with them (Ebony Blade is a proof that they can do it if they want - too bad it's bugged as a hive though).
I think that it would be much better if Necromancer's Amulet effects were:
- Able to conjure only undead units (so no more Deadra and stuff, you're a necromancer now).
- Can have an additional raised zombie (stacks with twin souls, so you can have a total of 3 reanimated zombies at a time).
- Zombies have +25% damage bonus.
Also, I think that Necromancy perk shouldn't increase duration of raised zombies, but should prevent defeated ones from disintegrating.