The way I see Poe's writing:
I believe that Poe could be misunderstood, looking at him from a biographical standpoint, the significant events such as being in debt, never knowing his birth parents, his fiance married another man while he was gone, and had a problem with alcohol. His poetry tries to understand common human emotions, he just happened to experience significant human emotions throughout his life, creating substantial visceral images that have been associated with his writing, often times gloomy as he thought his life portrayed. However he does find beauty in the world, not his own world, but finds it with the beauty of language. Much like Wallace Stevens poetry tried to take language to further extent it could, Poe also did that in an pre-modernist era.
The poem Al Aaraaf written in 1829, three years after his fiance left him. This poem defines Poe's poetry when he was drawing on the rawest human emotions he could grasp at this time in his life. We get a sense of his imagination clearly with his dense analogies exterior unattainable places, places he creates for himself to go to get outside the reality of the world. His study into other religions is also fascinating in this piece of work, he uses the Qur'an to help describe the medium in between heaven and hell, but also a place where the individual could not feel happiness. I always interpreted this as life, because it seems like life you go from both of those places quite often. Looking at Poe as an overall author, I believe he contributed immensely to literature as a whole, however it a long time after his death for his work to be realized. I certainly believe he was a true modernist before the definition existed, he questioned religion, human emotions, social constructs, and good vs. evil.
However his essay The Poetic Principal argues against didacticism, the principal if a work of writing is too instructive, then it loses its ability to influence readers in ulterior ways of interpretation. Poe believed in this perspective of thinking and I think it answers the ambiguity behind lots of his writing, is that if it lacks an exact definition, it gives the poetry a chance to gain meaning overtime, much like a person gains perspective over a lifetime.