Nintendo executive says selling systems comes down to having compelling software. Nintendo's Wii dominated the last generation of consoles, selling 100 million units, compared to around 80 million each for the Xbox 360 and PlayStation 3. But so far in this generation, the PlayStation 4's 7 million units sold is already ahead of the Wii U's latest confirmed sales figure of 6.17 million, despite Sony's console launching an entire year after Nintendo's. ...