Damage wise, Necromancy will never compete with warfare simple because those physical attack scale with weapon along with all the stats and skills. Necormancy doesn't.
The one thing that makes necromancy ridiculous OP though is "Death Wish". That's probably the strongest steroid in the game now if you're below half health and you can completely negate the damage effect with recovery. You can just give it to your ranger at the start of the fight (Drop his health to half first. He's not at risk anyway if he positions himself really far away) and watch as he completely assassinate a single enemy in one go.
