I have said this before and I will say this again. People here in SW don't seem to understand what "nostalgia" means and how it works differently for games from books and movies. Let's take a look at the definition of the word taken from The Free Dictionary.
nos·tal·gi·a (n-stlj, n-)n.
1. A bittersweet longing for things, persons, or situations of the past.
So when a person gets nostalgic, he is longing for the past and not the present thing. A person affected by nostalgia wouldn't play the new Nintendo games. He/She will prefer or even defend the "past" Nintendo games. So in actuality, the people who yell at Nintendo for using nostalgia to sell their games are the people affected by nostalgia themselves. They refuse to try and see what's something new because all they can see from Nintendo is the "past" Nintendo.
What Nintendo uses in their products to sell isn't nostalgia. It's called "familiarity."