Criticism is like politics: if you don't make your own you are by default accepting the status quo and are finally yourself responsible for whatever the status quo does to you.
Poetry, Poets
the next time you hear someone in a workshop remarking on how good a particular free-verse line or passage sounds, scan it. The odds are that it will fall into a regular metrical pattern.
. . .criticism is to poetry as air is to a noise: it allows it to be heard; and even if we can't see it or feel it, it is there, shaping how we hear.