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As to the Mantid, nearly all of their stuff is covered by the Dreadwastes / Townlong steppes lore and your interaction with the Shadow-pan. When the "heroes" arrive in townlong, You find out that the Shadow-pan defenses are practically on the edges of collapsing due to the constant Mantid Attacks. The mantid ARE a major threat, as can bee seen by the massive numbers of them being thrown at the wall, and if it wasnt for our efforts as players all of pandaria would probably be knee deep in panda corpses and mantid invaders. Thankfully the swarm was started pre-maturely and so is not really at full strength, and we have the Klaxxi, who are more interested in preserving the cycle (which incidentally, considers successfully killing off the non mantid races a BAD thing) to help us put an end to it before it becomes a problem.
I realise the game is called World of Warcraft, but that does not really mean that every single expantion has to be devoted to Alliance / Horde smashing eachother's heads in. I mean, that can only go on for so long before it becomes stupidly obvious that the only thing preventing one side from wipeing out the other is shoddy plot armor.