Poetess Laureate
Grimaldi
Poetess Laureate
There
are fairly set or at least widely-agreed-upon criteria to judge whether it is good.
Such as?
That said, primarily whether poetic devices are at least employed (and hence whether it is indeed poetry vs. prose) and whether they are effective; that is, whether the elements of craft are getting the reaction in readers that the poet desires.
I
think that's what I just said...
But nobody's written "How to Write a Successful Poem," because all anyone can say is: here's what you should use. Use them right.
And give some examples.
A poem may employ metaphor, but the metaphor is not apt. A work may use personification, but end up cheesy. Your verse may contain allusions that are obscure, or word play that is confusing -- well-meaning ideas that are flat, boring or inconsequential.
Who can teach you not to write bad poetry well? Nobody.
Spelling? grammar? line breaks?
Either automatic or secondary.