I pre-ordered a 15" MBPr upon release. That one came heavily scratched on the palm rest and lid. 3" long, scratches deep enough you could feel them with your fingernail.
Took it into my local Apple store and they gave me a replacement, yet after just a week six pixels stuck, as well as showing the much talked about pronounced image retention problem (burn in to some).
Long story short, three replacements later and no progress. So I got out of that one and waited.
Two weeks ago, I decided to try again, since it's my past experience that Apple will make some unspoken, silent rolling changes which cure some of the early model issues.
The current 15" MBPr I have is just fine.