I think his games works so well in his own ways is because he's not a gamer.
If I design a game, it would be way too complicated and only I would understand how to play.
That certainly will not sell, regardless of how awesome it could be.
I think he contribute greatly to the Wii with the concept of pick-up-and-play. Luring more people into gaming and then they will eventually pick up and be able to play all those complicated/niche games that we (long time gamers) love.







