I can remember a few issues with certain DVDs, like The Art of War, way back where they wouldn't play on certain players. I think the Bluray problems are a little more widespread and it all boils down to bad Q/A. The Blu-ray Disc Association should be fining the companies putting out these defective discs. I think it's a big blow to Bluray's image. At least with the Hulk they caught it fast and shipped new discs out really quick.