btw, guys, I'm finding this thread in several months. sieanr and Bod: feel free to do the same =)
Bod says nowhere near Halo (even though MGS1 and Halo 1 aren't far off), and sieanr says less than 4 million, closer to 3 million. Wow.
I'm saying about 5 million LTD (again, about what Mario Party 8 has done, and about 3/5 of Halo 3). Feel free to quote that.
Using Halo 1 / MGS 1 as a comparison point is obviously flawed: since that time, Halo has gone up in sales, MGS down. It's like comparing SF II to Mario. One of those series has seen a significant and obvious decline since that time frame. If you think the trend for MGS is an aberration, go ahead.