Wow, I was not expecting such a moving speech.
Mario enemies definitely have the advantage of being consistent over the years. Goomba's have always looked like Goomba's, Koopa's walk on their hind legs now, and Thwomp did get a few redesigns, but by and large they do stick to the same style guide; for better and for worse.
I think Wii Sports might be a fun game for a first game, assuming they don't throw the Wiimote into the TV.