Obilivion was a huge seller for the 360.
I remember waiting in line on November 21st 2005 for the 360...Most of the gamers bought the 360 for Oblivion, which was supposed to be a launch title but got moved.
Gears was also a big title in 06. Sold almost 2 million copies according to NPD in November-December of 2006...That was huge for the 360.
Back from the dead, I'm afraid.