If a wine is too sour, too sugary, too astringent, too hot (alcoholic), too bitter, or too flabby (lack of acid) then it is not a well-balanced wine.
There is no single formula for all wines, but there should always be balance between the flavors. If a wine is too sour, too sugary, too astringent, too hot (alcoholic), too bitter, or too flabby (lack of acid) then it is not a well-balanced wine. If it is young, it is not likely to age well; if it is old, it may be falling apart or perhaps completely gone.