@jestern. Yes, I agree to all points. But actually, my old burned CDs are good, and I expect them to remain so, because of the silver/gold alloy and the durable dye Kodak used. I use Nero.
My understanding is that detoriation in the aluminum layer is one of the problems. So it doesn't help when discs are factory pressed and don't rely on fugitive dyes. And as I said, my problems have mainly been with pressed discs. I always assumed that the aluminum layer would hold up if I just stored my music CDs well, and didn't expose them to humidity etc. Well, that turned out to be an illusion. This is an important realization, since it concerns DRM and justified copying. I hate pirate scums and I have some understanding for DRM. But this is crucial issue: The original is not permanent. I imagine movie DVDs and Blueray will run into the same problem eventually.
(and, of course, none of my discs are scratched. That's not the problem. They look pristine.)