Was comparing them on the same sales period (first 8 weeks).
MW3 did 12 million on 360, 10 million on PS3.
Blops 2 did 10 million on 360, 8 million on PS3.
The numbers are basically tracking the same in terms of growth, only with a drop of 4 million units overall.
As long as they keep on selling they will always be making the game. Good luck to those who are yet to realise that it's pretty much the same game over the last 3 or so installments.