Mediocre, bad, or not so ideal recordings, for various of reasons, can sound confused, lacking in life and in some cases are barely listenable in lesser systems.
Still they will never sound ideal, but how many times have you heard the phrase from a friend or dealer saying that his or her system does not play well because of a bad recording, skip or be cautious.
Same material on a well balanced and better system is transformed to something with a meaning, easier to follow and the performance has more juice.
Compared to the majesty of what a great recording can offer, these ones are more than lacking but at the same time you realize that your music collection has grown considerably.