Seeing as you haven't read the Arabic version, that renders your conclusion about it being easy to come up with void.
I'm sorry, but no it really doesn't. The content itself is incredibly horrendous, contains insane amounts of contradictions (acknowledged by schools of Islamic theology for centuries with many attempts to apologize for such problems) and it contains outright falsehoods. It says that the Earth is flat and that mountains are its roots.
I can judge the content of the book without being able to read it in its original language. I may not be able to judge the poetic value of the text itself, but the presence of any poetic prowess doesn't really hint at divine inspiration.
Once again, we're talking about the English version here, right?
No, we're talking about the Qu'ran in whatever version.
It's not just that though. And you have to be fully aware of the extent of that "aesthetic achievement" to judge if something similar can be written by a human or not.
Do you honestly think that a book containing contradictions and outright falsehoods is better than Hamlet? Better than Catch-22? Better than Paradise Lost, Anna Karrenina, The Divine Comedy, and Don Quixote? Also, oddly enough, those last three are all written in other languages yet their linguistic prowess, depth, and beauty all translate quite well to the English language.
Greater works than the Qu'ran have been written by humans. In fact, I posit that Sandman, the graphic novel by Neil Gaiman, is a better work than the whole of the Qu'ran. I posit that The Satanic Verses by Salman Rushdie is also a better work, which is probably why that fatwa was issued against him.
So? How is that relevant here?
It's relevant because I've never read Plato in its original Greek either and people claim that Plato's original text in classical Greek is among the greatest texts ever written, if not the single greatest literary achievement in human history, yet that beauty adds no strength to Plato's arguments. It also doesn't decry us to claim that his work was divinely inspired.
Your argument, it is full of many holes.