Without getting into the debate of what qualifies as "rock" I'd offer the observation that many LPs from the past offer delightful tidbits that one can focus on even if the overall recording is only mediocre. The person who can focus on the positive attributes of a recording is going to enjoy his music a lot more than the fellow who is more interested in perfect sonics than the music.
Recordings are the one aspect of having a nice system that we have virtually no control over. You can only play what the record company releases. Sometimes you get a "remaster" that is better (and sometimes it is worse.) So it gets back to the music itself. I always feel a bit sorry for the person who can't listen to a great song because it is deemed to be not up-to-snuff in the technical aspects of the recording.
Recordings are the one aspect of having a nice system that we have virtually no control over. You can only play what the record company releases. Sometimes you get a "remaster" that is better (and sometimes it is worse.) So it gets back to the music itself. I always feel a bit sorry for the person who can't listen to a great song because it is deemed to be not up-to-snuff in the technical aspects of the recording.