Lets keep this on topic before the locking takes place, eh?
At any rate, X360 software sales vastly outpace Wii and PS3 as of 2007. X360 s/w sales are on par at this point & time with wii (X360 2006 vs. Wii 2007).
Example:
What Wii games have sold incredibly well this year?
For the 360, we've had GOW sell about 500k more, Crackdown with 650k, GRAW 2 with 500k, GH2 with 500k. This doesn't include the 3-5 other games with 250k+ this year. Sales for the past 4 weeks have been neck and neck with Wii due to SPM and strong Wii play sales. However, outside of the past 4 weeks, the 360 has been ahead by around 100k to 200k per week. In December, the Wii sold 3.0m s/w units, versus the X360's 5.2m units.
Therefore there is no argument, outside of people trying to justify something that just isn't there. The 360 isn't selling great in hardware, but the software tier ratios are just insane. They are nearly twice as much as the 3.0 the Wii and PS3 are currently at.