I've gone thru nearly half my HD DVD collection, re-ripping them. Nearly all are still fine. I did come across a few that won't rip now. Ocean's 11 and 12 won't rip now and they did before and I checked them in the player and they freeze up from time to time. If I can skip past them quick enough the player won't freeze, if not I have to start the disc over and skip past the error then it will play. Freezes up about half a dozen times so I ended up finding a Blu ray set of the first two movies, the third movie was fine. But I will not bother playing the HD DVD's again.
Workprint disc of Blade Runner is bad, but I never checked it before, only the main disc. There are visible scratches on it though so it was probably bad before. I haven't tried playing it, but it won't rip. The other two discs are fine. My Harry Potter set is bad besides Azkaban but I knew that before, I've picked up 1-6 Blu ray for cheap.
Forbidden Planet disc won't rip now and it did before, I haven't tried playing it yet. I think that was all so far and this is out of 90 plus discs, still have over a 100 to go thru, many of them are WB's discs. I think overall, they're holding up. If they were fine before they're still fine, but a few have mysteriously gone bad like Ocean's 11/12 and Forbidden Planet. I do think scratches will ruin these HD DVD's worse than blu rays because they don't have a protective layer so you have to be real careful with them. I plan on keeping mine for backup purposes.
I've noticed some discs, mainly some imports have inferior MPEG2 transfers while there are newer AVC transfers on Blu ray. I picked up Resident Evil on Blu ray just because it has a newer transfer. The MPEG 2 version really doesn't look that great to me. Also Fantastic Four 1/2 are MPEG 2. I would suspect that most imports are just MPEG 2.
This line intentionally left blank.