1978 was the worst for me. For one thing I just loved that team. Yaz, Lynn, Rice, Fisk, Dewey, Boomer, Eck, Tiant, Spaceman...what a team, but nothing to show for it.
Also for me what made 1978 so crushing was that it was the end of the dream that had started in 1975. Lost the World Series in the 7th game that year but we still had a great team. 1976 just sucked but in 1977 we had another strong team and then in 1978 we added Eck and Torrez and got out to the big lead.
Not to mention it was the MFY's who won it all in both 1977 and 1978.
And after 1978 the great Sox team was quickly and stupidly dismantled.