Not necessarily. The iPhone, for example, probably had very few users prior to launching. (though the handful of users that it did have, such as Steve Jobs, probably provided a lot of critical feedback)
That's a valid point. Then again, the 3G iphone has push email and exchange support, which looks to be an improvement that came directly from user feedback.
There's got to be some sort of quality of user/user feedback/time launched algorithm in there someplace. :-)
