I have a lot of experience w/ the runemaster but little with the Necromancer. With the reanimate having no armor and few hit points, he looks like he would go down in one hit to any act II monster, meaning the necromancer seems like he'd be spending many actions resummoning the little guy. Having things like corpse blast expend your reanimate seems to make this worse (compare to the comparable runemaster skill, which doesn't put you at an action deficit)
What has your experience been like? Is he cool in the later game?
Aren't there Necromancer skills that buff up the Reanimate?...