To me also it's actually a 7.5-7.75/not a straight 8 due to the slightly repetitive level design/assets/secrets approach and no surprises/unique situations of any kind but still a clear step forward (not least in overall conciseness) from Into the Dark Forest Rem. where some parts of the map were just entirely redundant run-throughs (and there's again no shortcut of any kind to get back to the start once all is done but this time it's at least less gross given the slightly more manageable mis...
Yeah, final showdown is more like episode from straight up shooter (like RTCW). It's complicated though: it faces you with challenge but different than usual challenge in stealth game. Esp. given poor character movement in TDS. On the other hand it was surprisingly interesting for me. Though I would rather have fully explorable Wolfenstein castle which would have been different and contrasting experience than village.
I seem to have enjoyed the key hunt more than you. I liked that there were always clear hints where to go next. I never got stuck.
Despite this, I would still rate the gameplay slightly lower than the 9/10 you assigned yourself. Searching the village got tedious after 5 hours. The janky battle arena at the end also detracted somewhat from the overall experience.
Kept Away From View: just follow the courier, erm rogue, erm keeper* (*according to campaign authors).
The transformation in the library could have had some real impacts in the campaign, as it is it feels ultimately very self-contained (and references to something that plays far after the originals should have been kept to a minimum) - that and the weirdly mechanical feeling about the sanctum's layout and (far too regular) geometry, as if made first using an automated tool and the rooms ...