What you expounded in your
earlier post, Daishi, is an almost textbook example of a thoroughly modern attitude toward literature and art. It is commonly called the “reader response” method, and it can very succinctly encapsulated in your phrase: This idea is very popular in our time, but flies directly in the face of the classical understanding of the purpose of art: i.e. that the artist wants to say something to his readers (or viewers, or whatever), and part of appreciating the work is to try to apprehend that message.
How the readers apprehended that message, and how they responded to the message, and other subjective things like that, are where the opinion comes in. But if a work is intended by the author to say something (and as an artist myself, I can assure you that at least some authors do intend that), then classical appreciation says we should seek what that is.
It's interesting that this discussion has turned around Tolkien's works, because if there was anyone who detested the reader response approach to literature, it was Tolkien (Lewis was not far behind). We know from letters and talks that Tolkien did not simply “not appreciate” people pontificating on what
Lord of the Rings “really meant”, he was outraged and offended. It especially got his back up when people would write him and tell him what he was saying when he wrote the work! He did not respond by saying “what's important is what it means to you”, he responded with scorn, angrily pointing out that those people that they knew nothing of what he intended to say and had no right to try to interpret his works to anyone – least of all him! This is one reason why Tolkien adamantly resisted all efforts to turn his works into movies (Disney was very interested in
The Hobbit).
Ironically, you turn right around and contradict yourself by stating that: It's one thing to say you don't like a story, but saying it has 'narrative failures' implies that there is an objective standard (i.e. not an opinion) somewhere of “proper narratives”, of which Lewis falls short. If the reader response has validity, then certainly nobody has any place criticizing the initial reader – the author himself – for an incomplete story.