I have very strong feelings -- from the movie side -- that making movies based on games just because they sold well is a really bad idea. There've been some like that that weren't up to snuff just out of the gate. It doesn't matter to us if it's based on a graphic novel like 300, or a TV show – if there's a great universe and story, that's what's interesting to us.
A well-done movie based on the lore of World of Warcraft could be a cool thing -- and it certainly sounds like that's what the people at Legendary want to do.
[Fan art by Ya Lee, and thanks Simon for the tip!]