Through the years I've learned to look at each disc and wipe it down - it almost always has fingerprints on it which can hose up the viewing. I've probably only gotten 20 completely unplayable DVDs in 7 years.
I was having trouble with some of their branded DVDs (they had "Netflix" in red around the middle). After the 4th one not playing I called to see if I was the only one having the problem - apparently I was! But they sent me an "extra" DVD to keep until I watched it to be nice
