Yes, of course. But combined with some sort of poll, it could be useful as media often reported as fastly degrading would appear as such.
Though the problem would be that some brands/mediacodes are less used than others, and could appear as having "less" problems than more popular brands/mediacodes. Just an example of things that could be misleading with such a thread. If you take a look at the media testing section of this forum, you'll get my point.
It's been some time now that I'm having a similar idea, but it would take more than a thread an a poll to collect really relevant data. People should reply to multiple questions, like at the Videohelp site. I think Videohelp goes too far, actually, and discourages people to report their experience because of an over-long questionnaire (I'm nevertheless thankful for it's existence!). In my opinion, something "in between" would be welcome.
It would be nice to have our own "survey" about degradation of media, but unless it's pretty well conceived and done, I don't think it will be of real practical interest.
Read also there : http://club.cdfreaks.com/showthread.php?t=148598