I really liked "narrated" guides, a style that was very popular for a brief period before going extinct in the early aughts.
They were guides written as if they were chapters on a novel, often told from the first person perspective. A lot of them had highly quality standards and were a joy to read, on top of being actually helpful guides.
The one for Indiana Jones & The Last Crusade was simply amazing.
A perfect example of the kind of game guides you mentioned is the one for SaGa Frontier 2 (not surprisingly published by PiggyBack—always extremely polished from an editorial standpoint, detailed, and excellently translated). I could also mention the guides for FFX and XII.
In my case, I’ve been collecting them pretty much forever, and like some friends above, I only use them during my second playthroughs to complete the games 100% and beyond.
I own around thirty of them, and over the past few years they've been attracting a lot of interest among video game collectors.
This SF2 one is written in French (as far as I know, no Italian version exists), and I bought it very recently.