This is very subjective, based on actual bottles tasted and for the older vintages a lot based on reading and other opinions, like Wasserman.
1931 - VOTC according to Wasserman and Aldo Conterno.
1947 - great vintage.
1955 - excellent. Only bottle tasted was Monfortino thanks to GdP.
1958 - great vintage, Monfortino my “best Barolo ever tasted”.
1961- excellent.
1962- good.
1964 - excellent
1967 - good (but Oddero Barolo and Barbaresco excellent).
All others mediocre to truly horrible (although 69 G. Conterno was very tasty)…
1970 - excellent
1971- great
1972 - no Barolo made, a disaster.
1974 - good to very good.
1978 - excellent, some great
1979- good to very good. (Monfortino a standout).
All others mediocre to awful.
1980 - good (Monprivato, Tenuta Carretta “Cannubi” excellent)
1981 - poor, (although a double mag of Pasquero Barbaresco was beautiful)
1982 - great, my favorite of the 80’s.
1983- good, some excellent (like the Giacomo Voerzio “La Serra”, made before the sons broke up the winery).
1984 - weak
1985 - excellent, some great (like Castello di Neive “Santo Stefano” Riserva).
1986 - fair
1987- fair to good (the Corino “Giachini” was an eye opener for me)
1988 - very good, some excellent (Grasso “Casa Mate”)
1989 - excellent, some great
1990 - excellent
1991- fair to good
1992 - weak
1993 - good to very good, great QPR
1994 - weak
1995 - very good.
1996 - excellent, some great.
1997 - good, some very good.
1998 - good to very good, some excellent. (“Maria di Brun” Barbaresco from Ca’ Rome).
1999- excellent.
Just my subjective opinions. I guess I have had more 82’s than any other vintage, followed closely by 78 and 93.I have had bottles from all the vintages listed except for 1931.
I did not do the 2000’s since I have had very few of those.
I left room for disagreement, and am not averse to being convinced to raise a rating or two. dc.