As beautiful as the Quran may sound in its original language I find it nearly unreadable in English. The book appears to have no structure at all and basically comes across as a one random thought after another strung together. It also has a habit of repeating the same stories ad nauseum. I don't find the argument attributing this characteristic to the fact it's non western literature to be very compelling either. The Bible was also written in the east and yet it is structured very coherently. Whether you agree with the message or not one can easily discern the author's theses in each book of the canon.
You are quite right about the structure of the Qur'an. It is unlike anything we are used to in a book. However, that is precisely the point - it is unlike any other book. It is fairly understandable that some people might find the structure less appealing than others - because that is a subjective matter. But I would suggest that you read the following article(especially the right column) which gives a beautiful annotation of the patterns and the timeline of the Qur'an. I'll just paste some portion of it here and you can read the rest from the site :
[Taken from:
Concept of time in the Quran]
"the Qur'an does not follow a linear exposition and progressive timeline as, for example, the Bible does. It raises topics, not according to a successive historical progression, but according to its own unique inner pulse and rhythm. If it was in a historical, chronological order like a book of history or a biography, it would have been particularized to the chronology of history. The Qur'an, however, declares itself as timeless, as a book that cannot be particularized and limited to a specific historical context. 'Verily this is no less than a Message to all the Worlds.' (Qur'an 81:27) Jafar al-Sadiq (a.s.) has said of it that '...it will continue on its course as long as Heaven and Earth endure, because it enshrines a sign and a guide for every person and group to come.'
The Qur'an breaks the chronological mould to declare itself free from the ties of time. It originates with God who encompasses time and is not constrained by it. The Book of the Realities of existence which the Qur'an calls 'the Mother of the Book' is on a different plane of existence, outside of the flow of time as we know it. It is from this realm that the Qur'an descended to the Prophet's (s.a.) heart, and from there, degree by degree descended in the form of the specific words recited as the Qur'an. Nasir al-Din Qunawi writes, 'The writing and the form of the letters and sounds originate in time, but what is written and recited is beyond time'.
'And behold, it is with Us in the Mother of the Book, sublime indeed, wise.. (Qur'an 43:3)
"
Hope this helps the next time you decide to pick up the Qur'an and read with an open mind. Peace.