A question I have thought about for some days, hence delay in replying.
For me, it’s not about whether I like the wine or not.
Some wines I dislike I class as quality, others I enjoy I wouldn’t
If a wine has more factors on the left than the right of the following list I tend to think of it as quality,and vice versa.
on slope - Vineyard - on flat
old vines - Vineyard - young vines
estate/chateau - Vineyard - bought in grapes
owned/leased/managed by winery - Vineyard - bought in grapes
by hand - Harvest - by machine
grapes sorted - harvest - not sorted
spontaneous - fermentation - cultured yeast
barrel - fermentation - tank
no additions - fermentation - enzymes etc
open tank/lagare/kuipe - fermentation - rototank
barrel - aging - stave/chips/tannin powder
bottle - aging - none
at winery - bottling - bulk shipped
embossed - bottling - plain
DIAM/screwcap/flawless cork- bottling - plastic bung/agglomorate/twin top/cracked cork