Wait for NPD then we will know if something was wrong.

Could reviews have something to do with it?

I know in NA, reviews are seen as a standard for how good a game is. I'm just speculating but maybe 1 week before the release of this game all the reviews were put up. Sitting on a 80 meta right, maybe people said hey, look at the load times, look at the graphics it hasn't changed 1 bit, look at the reviews and word of mouth it's getting for not adding anything to the series. Add all this up with the hardcore audience in NA and realize that people saw that Tekken 6 is nothing special and cancelled there preorders on a large scale.

Combine this reason with the fact that other great games have been released in the same month and understand that people can't afford all these games on release day. Instead, they may have picked up R&C,Forza 3,UC2,Borderlands etc.

Although, maybe the preorder data was a bit overtracked as well. Looking at the above reasons, hmmm there's your answer..

^ perhaps. but the disparity is too big.. i mean, there are also those people who didn't preorder and just got the game from the store. almost all the games i've looked at when comparing preorders vs. sales showed sales above preorders.. except tekken.

what day did this game release in NA? perhaps the people who preordered didn't get their game yet.. ioi is silent :O

I'm sorry? Care to explain how that factors into the buy? Is the game somehow worth less money because it is available on 2 systems?

The preorder numbers were just way overtracked. The software sales numbers on this site are already pretty iffy, I would imagine the preorder numbers have an even bigger margin of error.

I don't know about NA, but Euro preorders were supposedly around 1.1 million.

That has to be store preorders and not consumer preorders... Right?

I honestly think that people did not pick up the game yet. It is foolish to think that everyone who pre-orders will pick it up on release day. People have personal and business lives to deal with, and Gamestop is not open 24/7. Additionally, for a pre-order, you have to go the the exact store you pre-ordered from or your credit is not applied.

Those pre-orders will factor in to the second and third week sales. Don't forget that some pre-order bonuses are given at the time of pre-order, meaning that you can get exclusive content without ever having bought the game.
Shit, I pre-ordered Uncharted 2 and got the free booster. Then, I bought UC2 at a different gamestop. I then finally went back to the gamestop that I actually preordered from and changed my pre-order credit to MW2.

I'm not sure, honestly.