While 600k units is impressive, I would hold off a bit on calling it a success.
Since, if I have this correctly, Wii Sports Resort is the only Wii Motion + game released in Japan, very few of those standalone units sold went to people without WSR. That would mean WMP has a 5% attatch rate so far in Japan. While 5% week one is definitely good, it's still far from the 50% that I would myself see as a success.
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