I'll drop an even more controversial one and say that Morrowind's Dwemer ruins are the pinnacle of TES dungeon design, at least audiovisually even if the layouts weren't always a hit. Morrowind in general had the greatest portrayal of the Dwemer as these pragmatic, no-nonsense types of down-to-earth master craftsmen and it reflected in the rough, simplistic, tough, rusted feel of their architecture. The sounds inside their ruins are almost hypnotizing with the distant clanks of turning gears, turning mechanisms venting off steam etc. I absolutely despise that future games did to their aesthetic, turning it into pretentious, ornate, flimsy bullshit. Morrowind Dwemer were firmly of the belief that looks were secondary/unnecessary and it's only the functionality that truly matters.
Skyrim and ESO Dwemer were arts students.
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