Speaking of MMOs, SomethingAwful has an interview with an real, live MMO person!
Q: How often do larger companies actually listen and take suggestions from the players, and incorporate changes based on what players have suggested?
A: Depends on if they want to be successful or not. Players know more about a given MMO then their developers do. This isn't a joke or hyperbole, it's simple fact. Players spend a lot more time, both in man-hours and sometimes individually, then the people working on the code.