I think that when the majority of gamers on here with issues have the same problem (this guy is the only one without the dirty disc error), that pretty much rules out the theory that:
a) all of our brand new discs are dirty
collectively, our hard drives have failed
c) again, collectively, our dvd drives are faulty
I hope that someone is working on a fix for this issue. Don't get me wrong, I do understand the need to check certain things before calling it a full blown issue, but in this case, not getting the "dirty disc" error seems to be the exception.