Whether wine is good or not is a very subjective word, so generally speaking, to say that a wine is difficult to drink, it must be hopeless, reflected in these aspects:
Metamorphism. Wine spoilage is relatively easy to occur, especially after the bottle has been opened for a long time in a poor storage condition, that is, in a high temperature and high humidity environment, then it can really be described as a spoiled wine, and it can be spit out almost directly after drinking. That's why a lot of people are very careful about wine storage.
It's been a long time since the drinking period passed. Most wines are only available for 5-10 years. If a bottle of wine has been stored for 15 or even 20 years, even if there is no quality problem, it will affect the taste of drinking because of too long time, which is reflected in the appearance of a lot of sediment, and the wine feels very heavy when drinking, and the tongue does not feel any flavor.
Drink it directly without aging. This is rare, and not uncommon, because wines other than Beaujolais nouvelles are aged in oak barrels, and if they are not aged, they will be very spicy and irritating, and many people will not be able to appreciate the beauty of the wine at all. I hope you will do your homework, follow the one-person ** chain to learn wine knowledge, and buy and drink really delicious wine!