I found the absolute best way to check these HD DVDs (all you need is a computer and Xbox 360 add on) and interestingly (as identified), most of my problems are also Warner. I have talked to them, but we decided to wait until I can verify them all and send them in at one time. It takes about 45 minutes on my laptop to run a disc through but you don't have to baby sit it while it works. So far, of my 250 HDs I am up to about 100 with only 8 bad (8%)- not as bad as I feared, but still unacceptable.
And they wonder why people want to backup their disc collections?
On a side note, I am slowly "backing up" my collection, so to speak, by buying the digital rights to what I own through Vudu's Disc tto Digital Program- quality is very close to HD DVD (as I can tell so far) and also has DD+ audio. There is a thread in "Video Download Services" forum. Cost is $2 per disc (although so far, I paid $5 but probably overpaid).
Living the HT Dream...now in 4D.