Nintendo's next generation Wii U system was greeted with mixed reviews. It's a capable machine that meets the standards of modern console gaming and doesn't feel like it's pocked with omissions, the second-screen feature looks promising, and it offers a pretty decent launch lineup of in-house and third-party games. But at the same time many questions remain up in the air regarding the console's online capabilities and developer support in the long run, not to mention reports of bricked units following a large firmware update on day one.

Well, it doesn't seem like any of that is affecting the company's ability to sell the Wii U. According Nintendo of America president Reggie Fils-Aime, more than 400,000 units have been sold since November 18, a number that was reportedly capped by the company's ability to get units to store shelves.

"Wii U is essentially sold out of retail and we are doing our best to continually replenish stock," Fils-Aime recently told Cnet. "Retailers are also doing their best to get the product to store shelves. But as soon as product hits retail, they're selling out immediately."

Fils-Aime was also asked about Nintendo's decision to launch the Wii U a year before Microsoft and Sony are rumored to have new, more capable systems on the market. But the executive seemed confident that the second-screen approach is the "next innovation" in gaming and early sales will prove this point.

While the Wii U is off to a solid start, the 400,000 figure is a bit short of the Wii's first week numbers, which reached more than 600,000 six years ago. The Wii U launched at $300 for an 8GB basic model and $350 for a 32GB deluxe version. By comparison, the original Wii launched in late 2006 with a single SKU for $250.