why did mass effect 2 only sell 2.3m on 360?

[Michael-5]

Machina said:

What did you expect?

It's tracking nicely above the original and well on course for 3 million lifetime. I loved the game, and I wish it was doing the numbers Gears manages (and Gears did Mass Effect numbers, or worse, much worse...) but it's unreasonable to expect that.

3 million lifetime isn't bad, not all great games sell. What confuses me is how did Fable 2 sell 4 million despite getting significantly lower ratings? Why is Mass Effect 2 so far below Fable 2, Fable 3, Fallout 3, and Fallout: New Vegas? If they can all hit 3.5-4 million, Mass Effect 2 should be able to do so as well.

That all ontop of Mass Effect 2 being GOTY last year, on most websites. Just baffles me.

Also how did Uncharted 2's good ratings boost that franchises sales nearly double, but Mass Effect 2 not? I believe UC1 and ME1 are similarly rated and so are UC2 and ME2, so why did UC only suddenly get more popular?