Shaman / Enchanter are the kings of solo at the top end particularly...and every group needs a class that can slow hard mobs.
Druids can make plat just by porting people around, although they're less desired in the 50s for groups as their heals fall behind - still undervalued though, a good druid that keeps a DS on the tank, can throw a few nukes and can patch heal when the cleric is out of mana is still something I'd want
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Agree on the necros. I think sadly a lot of necros think sending a pet in and casting a dot on a mob that's going to die in under 30 seconds is contributing...they need to be healing, charming an undead pet where available and feeding mana to the cleric when they're low
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Above all that though, if you're playing for other people you won't enjoy it... pick a class you do enjoy and run with it, screw all the meta stuff, the min/max people, etc
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