http://www.vgchartz....blame-vgchartz/You can argue methodology, or personally dislike polling and statistics, but their methods are fairly sound.
I think it is a good metric to use, the vgchartz site. Their methodology is consistant, so while you aren't getting "official" nor "100% accurate" numbers, you are getting a ballpark figure that you can compare to the sales of other games using the same ballpark figures.
So comparing vgchartz DA:O sales to vgchartz DA2 sales is absolutely useful. However "off" the DA2 sales numbers are, the DA:O numbers will be off in a similar way.
Their polling is similar to how any kind of political polling is - you aren't getting exacts or guaranteed forecasts, but you get moods and predictors.
DA:O by their methods sold, overall, better than DA2 is selling. If you pull out PC as they have no PC numbers for DA:O, you can clearly see this.
What does this mean? So far, DA2 is selling ABOUT AS GOOD as DA:O sold from what I can tell.
That "1 million faster" claim seems fishy to me without some good evidence. Why even make that claim unless you are still trying to bash DA:O and directly argue with the DA:O fans who don't like the DA2 changes? It may be 100% accurate (though I would guess it's a close thing, either way), but the reasoning behind even stating it just seems to scream desperation. As does the "free ME2 PC copy if you purchase DA2 and register it by April 30th - please pad our falling sales numbers!"
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Disclaimer: Despite disappointement and issues with the game, I overall enjoyed DA2. I rank it above BG2 and Jade Empire on my personal list of BioWare games, so my opinions on this are NOT coming from hate. So just toss that logical fallacy away before you try using it on me.