If the Wii were still cool, Nintendo (OTC: NTDOY) wouldn't have had to take a heavy hand to its full-year earnings forecast. The company's profit fell 52% year-over-year for the past quarter, due in large part to a decline in the game's popularity. Demand has slipped, with Sony (NYSE: SNE) and Microsoft (NASDAQ: MSFT) gaining ground with the core market of zealous gamers. Also, it's seen its position eroded by Apple's (NASDAQ: AAPL) iPhone, which is picking up some momentum as a gaming platform.

Nintendo's Q3 operating profit dropped to JPY64 billion ($709 million), falling far short of the analyst estimate of JPY90 billion. For the year ending March 2010, the company has chopped its forecast to JPY370 billion, far lower than the analyst expectation of JPY442.8 billion.

After dominating the gaming industry for the past three years, Nintendo's Wii gave up its position in the top spot to Sony's PlayStation 3 last month. The company has also been hurt by an increase in the value of the yen, which has hurt all Japanese exporters. Yet, even by local standards, Nintendo isn't measuring up. Its stock price is down 28% this year, compared to a 14% increase in the Nikkei 225.