Certainly a great album and a gateway for many listeners. The same could be said of Brubeck's "Time Out" or Mingus' "Ah Um," Oliver Nelson's "Blues and the Abstract Truth" and a whole bunch of other great albums.
In 1959, the same year "Kind of Blue" was issued, Ornette Coleman put out "The Shape of Jazz to Come." This probably is NOT a gateway album, but, arguably, it is more influential than "Kind of Blue."
The problem with a label like "the greatest" is that, for a lot of listeners the album becomes not the gateway, but the endpoint. Why go any further if I've heard the "greatest" (particularly if I didn't like it all that much)?
In 1959, the same year "Kind of Blue" was issued, Ornette Coleman put out "The Shape of Jazz to Come." This probably is NOT a gateway album, but, arguably, it is more influential than "Kind of Blue."
The problem with a label like "the greatest" is that, for a lot of listeners the album becomes not the gateway, but the endpoint. Why go any further if I've heard the "greatest" (particularly if I didn't like it all that much)?