Forza 3's bundles are closer to 2 Million than 1-1.5 Million. It had a release bundle, it was bundled with ODST after a few Month of release and it had the Holiday 2010 bundle.
Despite this, Gran Turismo 5 did more than Forza 3's current lifetime (84 Weeks) of 4.83 Million units, in the space of 5 Weeks.
Forza isn't really a "competitor" to Gran Turismo just yet, despite how much Turn 10 want it to be. They're trying to bundle there way to success and it's still not working... So they turn to Kinect. If Kinect doesn't lift the Forza name to Gran Turismo heights, then there's probably no hope for it in the long run. Sure, reviewers say Forza is currently the better game (although Gran Turismo is the better racer, if you read the reviews), but in the eyes of the public... Forza is no GT.
