When is the result of using a given style viewable as flawed?An attempt to answer this ambiguous question could reveal the amount and types of ways that you could see a poetical work as having flaw and you could be led to wonder to what extent a person would employ subjective thought in their identification of a flaw. Is there such a thing as objective criticism of a poem?
Consider the following definition of " poem " from the New Oxford Dictionary.
" Poem: A piece of writing in which the expression of thoughts and feelings or the description of places and events is given intensity by particular attention to diction (sometimes involving rhyme), rhythm (sometimes involving metrical composition), and imagery"
Judging by this definition there appear to be, almost, no rules as to what a poem should comprise. With so few rules the writer of a poem is able to write, almost, any thing they want in, almost, any way they want. This means that the majority of decisions can be ascertained with subjective thought unless one chooses to conform to known conventions. Surely, therefore, only the observance of conventional and known ideas can lead to objective criticism being applicable.
With no observation of known convention the results of the effort to create a poem are born of subjectivity and could be criticized by an observer only in a subjective way. So, as far as the idea of flaw the purely subjective approach to the creation of a poem could make objective criticism almost, or completely, impossible.
Style of poetry, in the final analysis, can be produced, with regard to the aforementioned definition of poem, in any way you desire.