While the data here is limited, it is at least interesting to compare the sales figures across the platforms.
Given that we estimate (the pictured below) Army of Two's YTD sales at 800,000 to 900,000 on the Xbox 360, we can surmise that the #5 title for the Xbox 360 may have sold better than than the #3 title on the PS3.
However, the PlayStation 3 also has a much smaller installed base and some games, like Madden NFL, have sold to a higher percentage of PS3 owners than Xbox 360 owners.
Both the Xbox 360 and PS3 top 5 software lists are dwarfed by the figures for the Wii's top sellers. Starting with Super Smash Bros. Brawl above 3.2 million and ending with Guitar Hero III around 1.3 million, the Wii's top 5 games of the year account for somewhere between 11 and 12 million units of software.
Even more importantly, two of those games - Wii Fit and Guitar Hero III - retail for significantly more than the standard $50 or $60 fee for most modern games.
Equally interesting is that four of the top five games on the Wii this year - all except Super Smash Bros. Brawl - include a hardware component in the box.
Mario Kart has the wheel. Wii Play has the extra controller. Wii Fit has its balance board while Guitar Hero has its plastic guitar.
It's become clear that we've never seen quite a hardware success story like the Wii. Looking at the top five games on each platform this year, it seems we've never seen a software success story like this either.