Mists of Pandaria is the story of an outsider, washed upon foreign shores, who changed the course of destiny for herself (or himself) and the world entire. Pandaria and the rest of Azeroth shifted on the fulcrum he (or possibly she) provided - the mogu, the mantid, the sha all fell before her (him) and even the Thunder King himself lies dead at his feet... or hooves, perhaps. Also, it hay have been her feet. Because in the end, Mists of Pandaria is the closest any MMO has ever come to being a single-player campaign and an multi-player experience at the same time. Mists of Pandaria is about you, your choices, the impact you have had and will have on the world.
There have been tragedies. This isn't about those tragedies or what they might mean in the larger picture. Gods and dragons and celestials can worry themselves about what may be and what might happen - heroes live and act in the now. Given a bad situation, they take action to make it better. It can hurt, absolutely, but finding that balance between contemplation and action, to know what to do and then to do it, is all the difference. Let's tell that story, of one figure who landed a vagabond on a new shore.
There will be spoilers for Patch 5.4 and the legendary quest chain in this post.