So as you've stated, you disk worked fine on your friends console. You also said " other MW3 discs" have issues on your console.
I'm trying to do my best to isolate the issue that you're having. Since you decided to post the support conversation public, We'll go ahead and do the troubleshooting steps here. I'd like for you to try another copy of the game and try it on your console.
Before using the new disk, make sure to delete the game data from your console. The reason why this is important is because if the disk that loaded the data previously was corrupted, then the game data on the hard drive may be corrupted and causing the issue.
Activision has a 90 day warranty and a paid replacement warranty in case you have issues with your disk. We definitely do our best to take care of our customers if something happens.
One thing I will note, you stated that you had the disk since it was released and only started having issues a few weeks ago. There can either be two changes that happened, either the disk has been damaged either cosmetically or from the center or there is an issue with the console. We will do our best to troubleshoot the disk and if it is a disk issue, we'll do our best to help. If it is a console issue, you would need to contact the console manufacture which would be Sony.
