I'm gonna start with a long, yet insightful quote by C S Lewis:
Critics who treat 'adult' as a term of approval, instead of as a merely descriptive term, cannot be adult themselves. To be concerned about being grown up, to admire the grown up because it is grown up, to blush at the suspicion of being childish; these things are the marks of childhood and adolescence. And in childhood and adolescence they are, in moderation, healthy symptoms. Young things ought to want to grow. But to carry on into middle life or even into early manhood this concern about being adult is a mark of really arrested development. When I was ten, I read fairy tales in secret and would have been ashamed if I had been found doing so. Now that I am fifty I read them openly. When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up.
So: don't worry acting like a kid (or in this case playing kids games).
But I see your point. I agree Nintendo could take a note from Sony in certain aspects. Making darker games (not neccesserily more "mature") would benifit Nintendo as it broadens their demographs. Imagine a more darker Nintendo game with all those awesome Nintendo game play and fun! They brushed some of this in Zelda TP really. The Lost Woods. That skull kid is/was a lost boy now wondering the woods looking for some one to play with. That's fucking dark. And the music made it all... even more... eerier.
But what Nintendo should learn from Sony is how to treat a great selling console at the end if it's lifespan! Sony's releasing NEW IP's at the end of the gen! Take note Nintendo!!! I wish Nintendo would risk putting out a more different game now and then, to test the waters. No need to NOT realese Mario or Zelda or what not. Now, honestly, releasing Wii Sports - and the whole Wii console - was a HUGE risk. Really.
I get what you're saying happy, and I agree somewhat =)
I'm on Twitter @DanneSandin!
Furthermore, I think VGChartz should add a "Like"-button.