is metal gear solid 4 undertracked

[Bodhesatva]

Actually I think it may be slightly undertracked too (for reasons I'll get into later), but it is essential to realize that the 3 million is a shipped figure, and VGChartz reports sold to consumers figures. Let me say that more simply.

Konami has announced that they have sold 3 million copies of the game to retailers (Amazon, Wal Mart, GAME, etc).
VGChartz has stated that those retailers have sold ~2 million of those copies to customers like you.

That's a lot of stock in the channel, though. Just from a purely shoot-from-the-hip standpoint, having 1 million copies in channel ("in the channel" is a term used to describe a game that retailers have purchased but they haven't sold to consumers yet) is a lot for a game that has thus far sold 2 million copies. It's not impossible, of course, but it's a lot.

We'll see, though.