Of course, what a person perceives as "mediocre" will change over time. That's why so many older music listeners find a lot of contemporary pop music very ordinary. They feel that they have " heard it all before", and, to a great degree, they have! This feeling also extends to folk music. I remember being thrilled and excited at the songs of Dylan, Paxton, Ochs etc in the 60s , but now I'm not thrilled or excited by Paxton's or Dylan's - or anybodies - current output. This is one of the "problems" of growing older. It's harder to find material that really excites the senses.