When people praise Morrowind, it's usually about the rich and alien world, complex nature of its story and lore, the freedom it gives to the player, the many political conflicts present in its setting that make it one the most unique of its time, heights that Bethesda never reached again.

However, I'd like to point some aspects of it that show how much attention to detail went into making it. For example, as I was exploring the West Gash region, I came across a cave and decided to explore it. Inside, I realized that it was pretty interesting, with underwater sections and even a hidden passage that led to a smugglers hideout. There was even a friendly NPC and a really rare in-game book about smugglers.

Then, I decided to search in a wiki if the place was related to any side quest, and it wasn't. It was just a random cave in the game that players could explore out of curiosity. Yet, it seemed like they carefully crafted it to look like a real place, a real cave used by smugglers as a hideout.

There are many other examples, like how the house of an NPC is organized in a way to reflect their field of work, social class or even personality. Just thought that was interesting.