One of the problems is that both schools and attributes were seriously gutted in OS2. In the transition from OS1 to 2, Necromancy lost its niche as the buff/debuff king, and in addition to the loss of Lower Resistance, Oath, Malediction and Drain Willpower (which would have been wonderful to strip MA off mobs), you also lost a pair of decent summons, Vampiric Touch and Death Punch. The 5th level skill for Necromancy is horrible and scales with Summoning better than it does with its parent skill.
Intelligence in OS1 lowered cooldowns of Int-based spells, and in addition spell slots were tied to your school, not yet another skill.
That's not getting into the source skill nonsense, which means you have to spend trips back just to refill so you can cast another master spell/Bless.
