If you run paladin/DK and elemental 4 shaman you can have 4 awesome DPS and "1" satisfactory healer. It's like having a party of 6.

No procs to manage therefore you will always get the best DPS just by button smashing macros.

They are easier to gear up. They can use mail, leather, cloth.

Great utility through totems + bloodlust.

Too bad I only have 1! I'd probably put at least 2 in my group next time.