A wine is described as “aigre”, which is sour. This is not a positive description of wine in English. Dry is “sec”. What are french terms for describing good wine?
Here is a link to a page from about . com which might be useful:
Thank you. That is an excellent site.
“A votre santé” 
That’s clear that when a wine is “aigre” sour , it is not a good wine . Usually it is when a bottle is staying open a long time that the wine is becoming sour
A good wine is a wine where you find the taste you like , it could be smell of flowers , or fruit or wood or even some time stone . But for me it is difficult to identify , it is necessary to learn