I suppose a good poetry critic would be something like a botanist or ecologist.
It's a strange helpless sort of flora that grows out of strange helpless sorts of people. You have to be patient & look at it carefully, give it time to express its little self.
With the propagation & wide distribution of so much free verse, these little sentences of prose divided into lines, without the armor of much in the way of rhythm, rhyme or sound effects, seem even more fragile. (Not that I'm against free verse, if it can manage to survive & flourish.)
A good poetry reader : part botanist, part bee.