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About edgar allen poe essay [11]
The problem with this sort of essay is that it's thesis is almost certainly wrong from the outset -- many, many writers have written stories meant to shock and horrify the reader. Most, apart from those by contemporary authors, are not now widely read, except in selected English classes. Yet Poe's work endures, and is widely read by contemporary readers, even outside of academia. That sort of staying power strongly implies that his work does in fact do something special.
Worse, how can you possibly conclude in an essay this short that "Edgar Allen Poe is nothing more than an artful adolescent - if stripped of shock tactics and an elevated style, Poe's works are reduced to nothing. I conclude that the substance in his short stories and poetry is entirely nonexistent." To prove that, you would have to go through every one of his works and show that everything good and literary that has ever been alleged about each one is contingent in some way upon his shock tactics and style. And even then, all you would prove is that no one has yet found anything appealing about his works apart from those two things, not that no one ever could (it is very difficult to prove a negative).
Also, if by "shock tactics" you mean the content of his work, then you are essentially saying that, if we ignore the content and style of Poe's work, then there's not much to it. But, if we ignore both the content and style of any author, what is left of his or her work?
Your essay, as your conclusion seems to acknowledge, mostly appears calculated to keep the reader's interest by fronting a shocking thesis that will offend virtually all of your readers (as people who don't like Poe probably won't be reading essays about him). You might want to consider writing an essay that says something substantive and provable about his work. So, if you think he relies heavily on shock tactics, look at examples of shock tactics in his work, and see if you can see patterns that would allow you to say something about the way he uses them that you could actually prove in an essay of this length.