Something well-written of course, like Consider Phlebas [1]. But good literature doesn't necessarily need to have "more self-knowledge than talent". The Odyssey and the Illiad, are not particularly known for their deep philosophical understanding, and yet they were passed down generation to generation, mouth-to-ear for thousands of years. There is something precious and unique to be found in great stories that are nothing more than great stories. We should welcome and celebrate work that goes a bit further than that, but well-crafted tales of a specific genre also have value.
Also, they're much easier to write and read.
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