
Originally Posted by
Veyne
To put it simply, Humans are too modern.
The Druid and the Shaman classes are both extremely in-tune with the spirits of nature, and even though all races that can be them have been around a lot longer that humans, humans are the only ones that have made great pushes into "modernizing" their societies. Humans rely on their Priests to be spiritual leaders, where as Druidic and Shamanistic races tend to value either of those as their spiritual leaders (Night Elves are a little interesting, they value both their Priests and Druids).
Dwarves can only be Shamans because the Wildhammer clan, a separate Dwarven Clan that has lived more natural lifestyles, as opposed to the Dark Iron and Ironforge Dwarves, which are more modern, like Humans), have become a prominent member of the Alliance's Dwarven clans again.
Draenei being Shaman still irks me a little bit, but I can live with it with the whole Broken devolution thing.