Hmmm … In terms of data longevity and integrity (my main measure of disc quality) I’ve had relatively good experiences with Prodisc CD-Rs, so I find this post quite unusual.
There’s a stickied thread here about burning media too slowly. Seems it’s not a very good idea. IMO if the discs are rated for 52x, you should be using at least 40x to burn them.
By all means experiment different speeds (a good way to learn) but if you can’t get the requisite burn quality you may want to dump them.
But unless Prodisc’s CD production quality has gone massively south over the past 5 years, I can only guess that your problem is one of compatibility (your (cd player?) equipment just doesn’t like this type of disc) rather than one of disc quality or burn integrity.