Yes, indeed, you are so right! Unfamiliar music is at a disadvantage to start with, since it is... unfamiliar. It needs to be presented in the best possible light, with good sound. If the playing is not at least good [accurate, pleasant to the ear], then not only is the music ill served, but the listener [ at least this listener!] is thinking, I can't wait until this is over! Happily the level of general performance has risen since the 1970's. I am amazed at how good most orchestras are, even student orchestras. Unfamiliar music really needs to be recorded by good performers who are committed to the music. Thanks for bringing up this issue.