All right, then, for the sake of the discussion:
I think classification in terms of genre is quick, easy, and useful to the average person. 2D Mario, 3D Mario, Mario Kart, Smash Bros., all of these things need to be divided and identified according to common traits that identify them in concrete (but sometimes broad) ways.
More specific designations, like that between 2D Mario and the 2D Yoshi games, are also useful. It represents the depth and texture of the genre in a way that will still be easy to understand (though not so easy as when comparing to something like Mega Man or Sonic).
I'm not entirely convinced of the utility of dividing 2D Mario games from other 2D Mario games, though. There comes a certain point after which the only discourse it adds to is the discussion about the discourse. Now maybe I don't remember Super Mario Land very well, but outside of its setting I seem to remember it being more or less like the NES games, albeit more simplistic.







