Fact1----, that is not a well known fact because lots of Non Nintendo Fanboys are buying it too, though i agree at the moment Nintendo fanboys are probably the most popular of Wiis owners i bet it is only about half of current owners.
Fact2---the GC was an excellent machine, much better as a console than the PS2, however the incredible lack of third party support meant that there were few great games on it , and few games in total.
and despite my opinion that the N64 had the best games on it compared to the PS1, i actually think there wasn't much good about the system other than the controller, the N64 only really had two things over the PS1, better 3D capabilities (though PS1 had better textures and such so often made it look better) and no loading times....The GC is a much much better machine than the N64, but having even less third parties making for it than the N64 it failed in games.
All that shows exactly why hardware is the least important factor in how well a console does.
