Seriously SF, it's time for you to have a long, long night reading wowpedia. It's cool you get into the story of the game so much, but it's a little frustrating for you to repeatedly and deliberately contort lore to suit your perceptions of the game world.
Thrall is currently the most powerful shaman on the entire planet. His channeling at the Maelstrom is, along with Muln and Nubundo, literally keeping the world from being destroyed. It's also fairly clear he's going to be granted powers beyond anything any prior mortal has achieved when he becomes the next aspect of earth later in this expansion (the only other mortals who could claim to have gained even a shred of this much power are Arthas and Ner'zhul, both of whom paid for it with their souls). Finally, he is larger than PCs because of game design reasons, not lore reasons. His father was Durotan and his mother was Draka, both full blooded, normal orcs. He's a bit of a Mary Sue for Chris Metzen, sure, but I guess you're allowed to do that when you design lore as epic in scope as Warcraft's.
Diverging from the other stuff about Sylvannas, I'm extremely interested to see what the consequences of her "death" and subsequent "resurrection" at the hands of the val'kyrs will be. I get the distinct feeling we're not dealing with the same Sylvannas anymore, which is probably a good thing, since that one's storyline ended rather pointed with the end of Arthas.
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