Actually, those graphs don’t look that bad to me. The PI is well within spec (280). On the PO, we’re told to look at “areas” of high readings - not spikes. Most of the places where the PO graph exceeds 4 are single spikes, not sustained areas of errors.
The proof of whether it’s a good burn or not is whether the disc is easily readable. If you don’t already have DVDInfoPro, download and install it. Run the RPM test with that disc on a decent DVD reader. Look for the graph to begin on the left edge around 3x or 4x. It should steadily climb towards the right side. The actual value will depend upon your reader, but it should be somewhere around 6x to 8x unless you’ve done bitsetting. In that case, the speeds will be considerably higher. If the graph line steadily increases, that indicates that the disc was easily readable. If there are areas where the line dips way down, that says that the drive is having to re-read areas. If it dips repeatedly or if it dips really deeply, the disc is very difficult to read and should probably be replaced.
I have done quite a bit of testing with the Nero Speed program and it’s quality test, and with the two versions of KProbe. There is no question that the information is interesting, but I think far too much emphasis is being placed on the graph values. I’ve seen many discs that “failed” Kprobe (or CDSpeed) but they were perfectly readable and they played in any DVD Player I had access to. Obviously, one wouldn’t expect a disc generating a PI or 1000+ and a PO of 500 to be good, but neither are some discs bad that generate a PI of 350 and a PO of 20. In my experience, the DVDInfoPro RPM test provides a far more accurate picture of disc readability.