TWRoO on 14 November 2009
This post of mine shows a comparison of 1st years sales and userbases for NSMB and Mario Karts... it unfortunately is about a full years sales rather than the first couple of months, but it should show how easy it should be for NSMBWii to beat the early weeks of Mario Kart Wii.
http://www.vgchartz.com/forum/post.php?id=2793390
