Well I guess we differ in opinion. I think it is worthwhile to try and better society.
But seriously, the difference between WoW and "Dude where's my car?" should be obvious. Some people take these virtual worlds very seriously and spend hundreds of hours of their life playing them. And with 5 million subscribers that is a significant user base. I think that is a little more pertinent than a 2 hour movie you may watch a couple times at most.