Clearly among the best adventures. A really huge amount of gameplay, probalbly far more than 20 hours. Tons and tons of puzzles, even some nice and clever ones.. The graphics are even today (2020) good - at least for an adventure: 4k, beautiful textures - and please do not miss the easter egg in the library! Twists and turns, many locations - variety rules. The hotspot system and all the other important "technical" aspects are next to perfect.
Yeah, you can count several flaws, even serious ones - e.g. the sometimes questionable taste including the sh-word. And of course the end. But still: So much is done right. That desevers a clear recommendation.