Best part about druids is,.. well at least you're not a ranger
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In all seriousness, Druids are fine. You get people places, you buff, you spot heal, you can do good burst spell damage (outside of bosses), and you can charm in certain raids.
Come SoV, you can heal even better. You can atk debuff. You get one of the best group HP buffs in game.
Druids are fine. They aren't a needed class, but they make a good addition.