I'm not sure what you expected to accomplish besides stirring up the nintendo fans with this thread segajon. The exact same question could be said about every single console ever made.
Hell, a better question is why in gods name do people play flash games? Flash has to be one of the worst (if not the worst) media for games ever invented and yet, tons of people play the stupid things.
People buy games that look interesting, the same as people buy books that look interesting, or movies that look intersting, or any other form of entertainment you can buy and plunk down in your house.
I never judge anything based off what a critic says, even if they all agree, because I prefer to make my own opinion (though to be honest, I don't buy many games because of teh cost). I own tons of movies that were critically considered disasters, Waterworld comes to mind. I love the movie, but I understand that most people think its horrible. Good for them, but that isn't gonna stop me from watching it...