I would say the Shaman by far and away is the most interesting to play of those three. You can tank better than any caster class, have like 12 gillion useful spells, you get a pet, you GET SOW AT L9, good DOTs, heals, upper level buffs are killer.
Shaman has many varied useful tools, the other two are pretty much one-trick ponies who end up doing very little when things are going good, as Naxy pointed out.
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