Do not be cross with poetry

[billy]

you can say "i don't understand it" for starters.

that is true, but if it is all there available to be figured out and you cannot understand it because you lack the aptitude, how useful is that critique?

well if you're critiquing in serious and say that when not understanding then you're possibly a twat and in the wrong forum, if you say such a thing in novice then you're probably as new to feedback as you are writing and because of that fact it's the most important critique you can give. somewhere down the line there will probably see an answer that opens the poem up for you and will save such for further interpretations of poetry. it's called learning. most of us start somewhere; saying i didn't understand this or that is probably the best place to start if you don't understand it.
adversely it really could be a piece of shite that no one else understands either in which case it reaffirms to the poet their poem doesn't work for anyone.