Of course it is. I have four albums on HovaGirl's list and I wouldn't listen to most of the rest if they were offered me for nothing, but that's me.
I can only answer the question that was originally posed and I think the early to mid-70s were terrible for music but there'll be people who love it just as there'll be people who love music from the other eras that have been mentioned.
Out of interest, which ones do you have from my list, and which ones wouldn't you give the time of day to?