Millenium your figures for ME2 are wrong. Understandable since Vgchartz itself makes this mistake. However look at this article. http://www.vgchartz.com/article/6744/americas-preorders-chart-23rd-jan-2010/
There we go ME2 at 1 week to launch is at 475k, not 414k as you have listed. I pointed this out on the last vgchartz preorder article but it got downvoted. Site is doing the same thing for FF13-2, where it is taking FF13's 2 weeks to launch as 1 week to launch.