Think of a shaman as having two really powerful dots (except in the early levels), and a Necro having a ton of powerful to really powerful dots. Some of them overlap, but the necro has so many other dots it's not really a problem - most of what you're hunting shouldn't require all of a shaman/necro's combined ammo anyhow, and for tougher or named mobs, you can both go to town.
Plus, having the regen and other utility buffs (haste for the pet) makes Shaman/Necro a fabulous combination.
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