There is doubt in anyone's mind that the Nintendo Wii has been on top in the console wars, even though it sits in a league of its own, seperated from the heavier contendors.  As for the Wii's repertoire of games, there is the common misconception that its third-party ones don't sell as well as first-party productions.

As GameDaily speculates, this is likely an assumption based on sales ratios:

While third-party software sales comprise well over 80 percent of total game sales on both the Xbox 360 and PS3, on the Wii that number dips all the way down to 56 percent. On the whole, however, because total Wii software sales are so high, even 50-something percent of a huge chunk yields a larger total for third-party sales.

The fact that both the Wii and Xbox 360 have more third-party exclusives is another matter.  Regardless, the NPD Group has confirmed that for each console's first 20 months on the market, the Wii sold more third-party software in the U.S. than the 360 and PS3. 

Anita Frazier, NPD industry analyst, commented on the data depicted in the chart:

"I actually think that given the number of comments made from industry executives at E3 (or thereabouts) about how they didn't put enough resources against development of Wii games that the industry has realized that the old adage of 'only first-party games sell on Nintendo systems' is absolutely incorrect. I think you're right that the data will cause a few eyebrows to lift."

In that 20 month period, Nintendo's "toy console" sold a whopping 33 million units of such third-party games.  On the other hand, the Xbox 360 and PS3 each sold 29 million and 20 million, respectively.