My buddy had an OG 360 that scratched his discs. He thought it was his car's CD player, but then I told him about the 360 was known for it, even if you touched it a little while the disc was spinning. Looked at a few of his games and most had small circular scratches. This, along with one case of RROD and his disc drive that didn't want to read unless you inserted the disc about 8-10 times, are the reason he switched back to PS after switching to XB with the 1st Xbox.
The real problem is that MS likes to save a few cents/dollars on each system by skimping on the disk drive quality. That hasn't changed since the OG 360. The Slim isn't supposed to be touched/moved at all, either, or it will scratch disks. And the XBO can't be played vertically because of its cheaper disk drive, though I think they have lessened or fixed the scratching. I think, anyway.
