http://www.wow.com/2010/03/12/rob-pardo-speaks-about-blizzard-game-design/
From http://www.blogcdn.com/www.wow.com/media/2010/03/pardo-blizzardpardo.jpg:
Although Blizzard has designed a, well, blizzard of great games, he mostly talked about WoW. While I'm much more interested in single-player RPGs, all of his points applied to some degree or other. The Blizzard philosophy, of presenting a really smooth gaming experience, really appeals to me. Even though my game might only need to be smooth and interesting for 20 hours, as opposed to WoW which people seemingly will play forever, it faces the same challenges.