Shaman is the only thing that fits all your criteria.
They are: Wanted on raids for their buffs/debuffs
They are: Wanted in groups for the same reason
They can: Provide good healing at 60 with torpor, but are pretty lax in it afterwards
They can: Solo without Kiting (very slow and difficult up till 34 when you get your pet)
They can: Dungeon crawl somewhat, at 60 if you do things right you could get some amazing stuns pulled off
However: Paladin will not have much trouble getting into groups. Can solo, just slowly. However, a raid that has 0 paladins on it aren't going to be hurting because they don't provide any crucial services that can't be found elsewhere. This isn't to say they aren't useful, they're just not key.
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Baalzy - 57 Gnocro, Baalz - 36 Ikscro, Adra - 51 Hileric, Fatbag Ofcrap - 25 halfuid
Red99
Baalz Less - Humger, Baalzy - Ikscro
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