I think there's room for all types of criticism.
When I started getting really interested in jazz, in 1960, I bought a book called "Jazz on record", which I've still got, its pages now a delicate brown. This concentrated on music on LPs released in Britain and was extremely superficial and limited. There was NO soul jazz mentioned: no Jimmy Smith, not even listings of Horace Silver albums. Not much hard bop either - no Mobley or McLean. I soon found out what was missing. But nonetheless, it was useful to me in its time, if only for placing musicians covered in their context.
And now it's useful as a record of what established critics thought in those days. I think one of the big problems with the Web is that it's only NOW - nothing's necessarily permanent to form a historical record of what people thought in a particular era (a much bigger issue than jazz, of course).
MG