Shaman & Druid have HP regen buffs. Druid has additional HP regen via the top two buffs in the skin line, and has self-buffs that give mana regen outdoors (54+) and anywhere at L60. Shaman has fantastic mana regeneration and slows. Cleric has much superior heal efficiency even without the 5% bonus they for some reason do not receive on p99, Cleric gets better & more efficient heals including HoTs, and Cleric has very efficient group healing via Heroic Bond buff at 52+, healing is what Cleric does. All three wis casters will get 10% reduction to mana costs via specialization once the patch fixing that goes live, although I do not know whether it is as common for Shaman to specialize alteration as it is for Druid (often) or Cleric (always).
Basically, Cleric is the one and the only. A well played Shaman can be a beast solo healer depending on group and content because of slows. A Druid can do the job, especially in a smart group that plays well against the content at hand.
The Paladin is a third-rate healer, or fourth rate without mana regen buff from an Enchanter. Better than no healer at all, but honestly the Paladin belongs on his feet. Paladin is great for tanking, pulling, CC'ing via root+off-tanking, interrupting casters, stunning+taunting+healing to save the Enchanter's highly valuable ass when the Cleric is overwhelmed, LH'ing the critical groupmate who is about to die (almost always the Enchanter or Cleric), & etc.
Why try to be a third-/fourth-rate healer when you have the toolset to be a first-rate tank?
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