I've been with Netflix for several years and I'm surprised that you are seeing 1 out of 4 being unplayable. I think in the 4-5 years I've used them I may have gotten 3 or 4 that wouldn't play. I don't know, maybe it's the DVD player.

BTW - check out the Instant Play feature. The playback is flawless (broadband cable) and the selection is adequate. I will watch a movie sometimes when I'm in the office smoking a cigar.