Incomplete information as a game mechanic

I must say that Raph Koster is one of the persons where I have difficulties to make my mind up what to think about the guy. On the one side I love his theoretical work, his book about the theory of fun, his talks at various game conferences, much of which is very brilliant. On the other hand he doesn't appear to have a knack for turning that theory of fun into games which actually are fun. I found Star Wars Galaxies flawed in many aspects, and not just technical ones. And Metaplace was so boring

World of Warkraft...