Overall, not too bad, but it misses a few important points. The article focuses only on the total number of units sold, ignoring any mention of financials or profitability. Keep in mind that the XBox always had the full backing of Microsoft's enormous resources; it was never supposed to turn a profit, and, well, it pretty much didn't. The XBox was sold at a loss from day 1, it had an unlimited marketing budget that eventually ran into the hundreds of millions of dollars, and Microsoft paid large sums of money to developers to get their games on their platform. In contrast, we all know that Nintendo managed to eke out a small profit every year despite the Gamecube's major struggles.
I'm not trying to offer that as an excuse; Nintendo made MANY serious mistakes in designing and advertising the Gamecube. They certainly should have been able to leverage their experience and brandname into better sales than the XBox. But any serious analysis of the sixth generation needs to give at least cursory mention to the financial side of things, because if Nintendo and Microsoft had been working with equal resources, the outcome almost certainly would have looked a lot different.
And really, the PS2 absolutely annihilated both systems (doing 5x the sales of both) so I'm not sure how much a 24m to 22m victory really means when the market leader sold 125m+!
End of 2008 totals: Wii 42m, 360 24m, PS3 18.5m (made Jan. 4, 2008)
