The argument is roundly ridiculous. We don't have weekly figures for the game, so you have no idea if it's front-loaded or not. You are extrapolating off one data point. I have no idea if ME1 or DA:O will prove to have sold the best in the end, frankly, I just know that you pulling the "it was out aaaaallll month" scam is just silly.
Next, Mass Effect did NOT show up in the December NPD in its release year. Here's the December 2007 NPD top ten:
360 CALL OF DUTY 4: MODERN WARFARE ACTIVISION (CORP) NOV 2007 MATURE (M) *1 1.47 million
WII SUPER MARIO GALAXY NINTENDO OF AMERICA NOV 2007 EVERYONE (E) 2 1.40 million
PS2 GUITAR HERO III: LEGENDS OF ROCK ACTIVISION (CORP) OCT 2007 TEEN (T) *3 1.25 million
WII PLAY W/ REMOTE NINTENDO OF AMERICA FEB 2007 EVERYONE (E) 4 1.08 million
360 ASSASSIN'S CREED UBISOFT NOV 2007 MATURE (M) *5 893.7 K
360 HALO 3 MICROSOFT (CORP) SEP 2007 MATURE (M) *6 742.7 K
NDS BRAIN AGE 2: MORE TRAINING IN MINUTES A NINTENDO OF AMERICA AUG 2007 EVERYONE (E) 7 659.5 K
PS2 MADDEN NFL 08 ELECTRONIC ARTS AUG 2007 EVERYONE (E) 8 655.2 K
360 GUITAR HERO III: LEGENDS OF ROCK ACTIVISION (CORP) OCT 2007 TEEN (T) 9 624.6 K
WII MARIO AND SONIC: OLYMPIC GAMES SEGA OF AMERICA NOV 2007 EVERYONE (E) 10 613.0 K
There is not even a 1% chance that DA:O will show up, but this doesn't really mean anything about it in comparison to ME, because ME didn't show up either.
Okay so you have decided to be dumb.
Please don't tell my my argument is "filled with holes" if you haven't read my post.
In my original post on this topic, which you replied to so I'm assuming you've read, I specifically explained that while 360
S3 ratio generally runs from 1.5:1 to 3:1, there are factors that change things. One factor is exclusive content. One factor is heavy retailer promotion for one system. One factor is that certain genres tend to break this paradigm; in specific, fighting games tend to do disproportionately well on the PS3 (this is possibly a controller thing, possibly a testament to early support like VF5 leading on PS3, and possibly just a natural thing given that PS2 was great for fighters and Xbox1 was not). Games with huge co-op and online community elements, particularly FPSes, tend to lead stronger on Xbox.
A combination of these factors explains the MW2 360
S3 ratio; it's an online community heavy game that was pretty much exclusively advertised on 360. That's why the ratio is slanted a bit heavier than most games.
Borderlands is just about the most obvious example of this possible. It's a game whose entire raison d'etre is online community--probably moreso than literally any other game released in 2009, and whose advertising was dominantly 360.
If you still feel DA:O PS3 sold less than 100k, I'd be happy to make either a permaban bet or a $100 USD cash bet on the subject to be paid out when either the numbers are released officially or someone here with the actual numbers confirms them.