@ Hawk
You should watch the video then. They tested various (different) systems simultaneously, they showed disc scratching, but that doesn't per se imply the notorious deep carved circle of death which renders all affected discs useless. In many cases like with DVD movie scratches you can still use the disc, but in course of time you will experience more and more problems with increased scratching.
Most of my 360 discs for example showed minor scratches, I took extra care with the Gears disc, but the game stopped at some point while bein place horizontally (AFAIR, it told me to clean the disc and reboot at random occasions). The little scratches I noticed on the disc were not present when I placed the disc inside the 360.