I kinda like how people can seriously claim "Without Metzen WoW would have better lore"..
With what criteria can one proof such statement at all?
Of course Metzen is not a top novel author. If he was, he'd probably make more money doing just that, writing books..
He doesn't have to be such author, because he writes lore, a lot of it probably, (how much exactly of it is factually unknown to us) for a video game.
WoW is just a video game, and doesn't need to fulfill the necessity of high level story telling.
The best story doesn't help if the game itself sucks. That's apparently the main feature of a video game.
In a way, unless someone can deliver bullet proof facts, the Metzen topic is similar to that of Ghostcrawler, or any other member of Blizzards management level. No clue about what these people actually do, but a judgment has to be made, regardless.