One thing I do like about what little I may have read of Aristotle, is that it does seem fairly clearly laid out. The opening:
I propose to treat of Poetry in itself and of its various kinds, noting the essential quality of each, to inquire into the structure of the plot as requisite to a good poem; into the number and nature of the parts of which poem is composed; and similarly into whatever else falls within the same inquiry. Following, then, the order of nature, let us begin the principles which come first. (Internet Classics Archive. http://classics.mit.edu//Aristotle/poetics.html p. 1)
What I as a fiction writer and poorly developed poet find interesting is the emphasis into structure and plot of poetry. Too often the poet feels that free verse in form allows as well for a series of rambling and disjointed thoughts, or the same single emotion spread and said repetitiously with imagery the only value in mind. There is structure, there is story, there is plot.
The Lost Children: A Charity Anthology