I seem to have a different definition of hardcore and casuals. It's all about how much they value gaming. Nothing to do with maturity.
On mobile so I won't get deep, but also I do have a problem with some of the things you're saying. You really seem to just be defending Nintendo. Why didn't you bring up kinect, little big planet, tearaway, knack, the curse of the brotherhood, or any other of the less mature games made by Sony and Microsoft? Nintendo certainly has the "kiddie" image, but they certainly aren't the only ones supporting this end of the market.