I have the same problem and M$ told me to buy a 1 year extended warrenty for $99.00 and send it in and they will take a look at it.As far as them replacing ANY game,they said they are not responsable for the 360 scratching games and to contact the game manufacturer to see if it qualifies for replacement but as we all know no game manufacturer is going to replace a game that is not a manufacturing defect,so I guess we are all up the creek on that one! My dvd drive grinds when you put a game in and when you go to the dashboard form gameplay.The games mine scratched are COD4,Halo3,NCAA08.Hope this helps.
