The following scale is used on grapeobserver.com to record the quality of wine:
Outstanding and Very Good wines are wines that are highly recommended, and have special attributes such as long length, complexity, intensity of fruit, resounding typicity and harmonious balance. Buy them if you can.
Good wines are just that – well made, show typicity and won’t disappoint.
Acceptable wines are everyday or unremarkable wines that are fault free.
Poor means that I didn’t like the wine.
Faulty means just that. Cork taint, brettanomyces, volatile acidity and oxidation are common causes.
The descriptions of the wines are more important than the scale.