I have experienced the distortion issue when importing to iTunes from a Superdrive but found it odd as it was a triple CD (Rickie Lee Jones compilation) and only two out of the three CDs were 'bad'. They played just fine in a regular CD player but even when playing directly from the Superdrive the huge distortion was there. I played around for a while then discovered that the 'good' disc (disc 1) was now also distorting which was very weird indeed, as I had just imported it cleanly.
I then tried (with disc 2) opening the CD on the desktop and dragging the files directly to the VLC icon in the dock.. Guess what? All the tracks played cleanly but even more weirdly, the CD in the drive now also played cleanly and at the next attempt also imported the files cleanly.
I tried the same with disc 3 and... it didn't work. Playback was distorted on iTunes, VLC and the CD. I was about to give up and buy a wind-up gramophone, when I thought I'd try dragging a track straight from the CD folder on the desktop to - of all things - Quicktime Player. Yup, the track played cleanly and instantly the whole CD would play cleanly through iTunes, then also imported cleanly.
This has to be a fixable software issue then, surely? It's certainly the most bizarrely erratic OS glitch I've some across to date, for sure. I'm wondering what other programs we could try if I can't get repeat success with Quicktime, should this ever happen again. Playback via Microsoft Word, p'raps.