There are many potential flaws in bad wines, and the sad part is that, more often than not, a bad wine's flaw is so subtle that it ruins our experience without us even knowing — well, almost. Most of the major flaws found in a bad wine are pretty distinctive, and getting to know them can help you separate the good wines from the bad wines.
It would be great for everyone involved if we all could tell a corked wine from a truly bad wine, and knowing the difference can end up saving you money whether you are returning a bottle out on the town, or bringing it back to a retailer. Get to know what’s wrong with your wine! Learn about bad wine!
— Gregory Del Piaz, Snooth