If the recording sounds like you sound, then the recording quality is acceptable. If you sound how the recording sounds then the singing is suspect.

When you have any credentials in music you may criticize others; I look forward to hearing Don's recordings in the expectation that I will enjoy them and probably learn from them.

I am sure however that if I were to offer suggestions as to how his performance could be improved he would listen to the comments carefully. If they had validity he would I'm sure accept the comments in the spirit offered. If not he would say why not.

You are in no position to offer anyone musical advice WAV. Really.

Stu