Actually, Boll himself tells the story over on MTV Movies as "we will not sell the movie rights, not to you.... especially not to you." Which is pretty hilarious. He himself also says that "because it's such a big online game success, maybe a bad movie would destroy that ongoing income, what the company has with it." So yes, he pretty much guarantees that any movie he makes would be a bad movie anyway.
So there's at least one great thing we can say about the Warcraft movie so far: Blizzard at least cares enough about the quality of the flick to not let Uwe Boll make it. This doesn't guarantee us a good movie, of course. But it's nice to know that the higher ups at Blizzard know to keep their property away from this nut.