There is not much point in trying to conjure up words not already written about Johnny Cash. To say Johnny Cash is unique is true but is inadequate because the word "unique," like so much of our language, has been robbed of its power by overuse and incorrect usage (I will save the language rant for another day). Unique. Icon. Mystique. Legend. If you were to describe Johnny Cash you might begin with those four words but you would not be the first to do so. All the good words to describe the man and his recorded legacy have been used.
And what a legacy! Damn near everything you care to say about the man and his records has been said. Not only that - he long ago reached that rare status where reviewing one of his albums is pointless. It would be like having some silly scribe reviewing the stone tablets Moses brought down from Mount Sinai. They are the Ten Commandments. What else is there to say? In that same way, this is Johnny Cash. He makes Johnny Cash records. No one made those records before and no one will make them again.
It is difficult to count the number of albums he released during his lifetime due to the number of knockoff compilations and other record company shenanigans inflicted upon his recorded works. He released his first album in 1957 for Sam Phillips' Sun Records. After that, it gets tricky. He had a 46-year recording career which does not take into account the cringe-inducing number of albums released since his death in September 2003. It does not require a lot of imagination to see the flood of posthumous releases and compilations as vultures picking at the bones.
Posthumous 'new' releases are often a disappointment on some level because artists rarely die with a completed album. That means someone else has to oversee the finishing of the album and it usually means the finished product is something less than what it could have been. It also calls motive into question. Is the estate or the label trying to make a quick buck on work an artist never intended to release or are they presenting work the artist wanted fans to hear?