Despite a year of awesome games, Gameplayer has examined the year-end console sales charts and expressed concern for the Xbox 360 in this article. They suggest that with the stellar line-up of games, Microsoft would have expected the console to do a lot better.
"In actual fact 360 sales in 2007, despite spikes during the release of Halo 3, kinda levelled off a bit. Selling roughly 9 million units up until the end of 2006, Microsoft saw fit to trumpet worldwide sales of 17m at the end of 2007, but why? Basically the 360 sold a little bit less..."