'hardcore' and 'casual' are definitions of how one plays a game, rather than a definition of the game itself. One can also be 'hardcore' at one game and 'casual' at another. An example of this is my Mum with Tetris on GB, from 2000 to 2009 (when I bought her Tetris DS), she play roughly 45 minutes of the game a day almost without fail, while I've probably only played about 30 hours in that time. She is the 'hardcore' Tetris player, while the same cannot be said for myself. On almost everything else (bar AS: Pictopict, Brain Training and Nintendogs), I am leaps and bounds more 'hardcore' than my mother, but not for Tetris. Equally, someone could hypothetically (and I'm sure they exist) be a 'hardcore' Wii Fit player as they use the game daily and have as a result lost significant amounts of weight.
I'm not saying some games don't lend themselves better to either 'hardcore' or 'casual' styles, but to see the gaming industry in that Black and White spectrum is just flawed as hell.
