Come on, even tutorial Windpeak Ruin dungeon is boring, despite being tutorial and as consequence filled with all objects you meet in dungeons: word walls, claw doors, oil paddles, combination locks, spider nests etc.
It is good for a cheap laugh (like I had when saw thatcatwalks of 3rd tier have safety cages), but they are not up to many-hour gameplay.
And actually there are only barrow ruin, dwarven ruin, fort ruin, temperate cave and falmer cave. FIVE tilesets for entire game.
Skyrim's dungeons are amazing! Handcrafted, unique dungeons
All dungeons in every TES game since Daggerfall are handcrafted and unique, it just doesn't make them interesting.