Verbatim -R with 1640

I couldn´t really find infos that explain me my Scan.
I have always thought a quality scan of 94 and nice green PI failures would be fine. But now I have a Class five in the advanced quality scan, which actually looked good to me.
I use a BenQ 1640 and Verbatim MCC 03RG20 at a burning speed of 8x.

I´m confused :eek: How should a good Scan look like? Whats important?