Chloroform in Print
Everyone knows the famous Mark Twain quotation about the Book of Mormon being "chloroform in print." For the most part I think he's right; its prose is less than user-friendly and its plot is fairly complicated. But I wonder if it's literary construction is that way for a reason. Isaiah, prophecying of Jesus' incarnation, writes that he "hath no form nor comeliness; and when we shall see him there is no beauty that we should desire him." You could say the same thing about the Book of Mormon.
Maybe this all goes back to Kierkegaards thoughts on aurthority and aesthetics. We don't want to mistake the beautiful for the authoritative, and one way to keep things clear is to make sure the authoritative isn't very beautiful. (I don't say that's the only reason for the Book of Mormon's clunky prose, just one possibility)