I've found that most 'poor' recordings only sound poor because the system/room I was hearing them in was not good enough to translate the acoustics of the space the recording was made in. There are much fewer poor recordings than we generally believe exist; and more poor systems/rooms that make us believe the recording was poor. The best sound/room systems accurately allow the decay and reverberation of the recordings to complete what we understand as the soundstage, such that what once sounded like a poor recording was merely an inaccurate or incomplete playback of the uniquely altered sound of instruments and music in the specific venue of the original recording.
In friendship, kevin.