I could tell from your VNDB, which is why i stopped. Nonetheless, the case of C;C is pretty peculiar as it goes to great lengths to maintain the theme's integrity and coherence. The route structure is a result of that, and it's only good if you care about the theme. Therefore, i can't fault anyone for disliking the routes.
Over sky on the other hand, is as you said impeccable. It is a perfect 10/10.
The structure was great with minimum downtime, and most of the scenes felt meaningful to the goal the story was heading to. It also manages to show managed to show the cast in this route as people, developing them throughout the route (save for Hana and Uki). You can just praise it tbh, there is nothing to complain about.
I wrote my impressions on Choas;Child already, so doing it again feels redundant.