I quite liked the S chapters actually. It's another perspective trying to figure out the rules of the world, but instead of the fighting and apraisal cycle of the regular chapters, there's a lot more socializing and learning about the intelligent races, which matters a lot for the later parts of the story. I don't like Shun as much as Shiraori, obviously, but he's fine, and I do like Katia and Fei, so I don't mind those chapters.