The gameplay is okay-ish, probably due to nostalgia, but the AI is not the smartest, which creates a lot of fun situations - two guards trying to hit a giant spider inside a locked prison cell with swords, hitting only the cell door, instead of pressing a button next to them to open it, while calling the spider by name of the protagonist. But I remember that it was one of the scariest games for me as a kid, when it suddenly turned into dark fantasy horror from "just a thief game". I really had to push myself to walk past some of the undead and absolutely needed to make sure I cleaned the level thoroughly to be able to walk around comfortably.
The world building, sound design (especially the ambient sound loops) and the aesthetics/general visual style is something really unique that keeps drawing me to this game and it's really telling by how well I remember some of the places, despite having not played the game for 10 years or so.
Really a shame they gutted the franchise with the 2014 game and the very recent VR one.