Most people have been focusing on Tauren Paladins. Blizzard gave a very good explanation to this and pretty much stopped the QQ
but one thing I do not get is where did troll druids come from? One could argue that night elves evolved from trolls when some camped near the well of eternity but Cenarius tought Night elves how to be druids who then taught the tauren. Who taught the trolls? There may be some explanation of this in that quest in Zalazanes fall where you find that troll druid (it bugged out for me horribly so I missed that hunk o' lore) but from what I can tell they just say that the troll druids have been in hiding waiting for Zalazanes fall. If any1 can think of a good reason and back it up with some lore then please post it (not just stuff like "oh but trolls are wild so I guess...")!
Thanks