Actually, I have long thought that The Silmarilion was intended for aficionados of Middle Earth, the sort who wish to explore sources and footnotes, and recite whole dialogues from the book (for example, any section from the Ents) to you after their fifth drink in a pub; good luck to them, but this is not my life's obsession.
As it happens, I explore quite sufficient sources, data and footnotes in my actual working life, (and yes, I love it) but I have absolutely no desire to acquire quite that degree of expertise in a fictional world, when my working world already adequately satisfies this nerdish need.
Instead, I am more than perfectly content to applaud the great stories told in the epic narrative of The Lord Of The Rings and of course, The Hobbit, a charming and elegantly told adventure (with a protagonist I, for one, regard as quite captivating and engaging) without needing to know anything more about the joys of Middle Earth.
I will say that I cannot recite dialogue from the books
But I do enjoy reading the footnotes.
Works such as The Silmarillion and Unfinished Tales as well as the History of Middle Earth in my opinion were never meant for the mainstream audience. The Silmarillion and Unfinished Tales for example are a group of short stories who tend to cover some of the more well-known historical figures in the history of Middle Earth and were fleshed out to give continuity to all of J.R.R. Tolkien's works involving Middle Earth.
I will also go so far as to say the reason they are not as "polished" as The Hobbit and The Lord of the Rings is that they were in fact un-finished! Christopher (I am lead to believe) had to do a fair bit of editing on the stories to get them to a publishable state.
Stories such as The Hobbit and The Lord of the Rings allow me to have such a vivid imagery in my mind as I read them, I become emotionally connected to the characters, the story, and the world. I find upon finishing them that I am not satisfied, yes a story is told, yes it has a beginning and an ending and a lovely building in the middle, but it is only a part of the whole story and J.R.R. Tolkien gave enough tidbits and tie-ins to the history of Middle Earth for me to want more. This is why I enjoy reading his other works so much and I seem to have a knack at looking at it from a bigger perspective which allows me to make more sense of the underlying story, timeline and history.
I can understand why people would not enjoy the books or go back for a second or third or fourth reading, and I for one do not blame you in the slightest, some of it is hard to put together, the flow of the story telling is stuttered, the stories themselves switching character perspectives, timelines so often, even in the one short story!
Sorry for going off on a tangent a little from the original thread title.
ASIDE: I may hasten to add that I can also read a dry book on history and be enthralled at the story as well. I remember reading a book from the '60's on the early Australian Explorers and being captivated in their stories.