I guess I feel the different dungeon layouts are wasted for the most part when they still feel copy pasted because the entire place looks the same as the last one. I'm referencing the draugr architecture. When the walls, floor, and enemies are identical to the last dungeon I was in, I don't really appreciate the different layout. It may be in part due to the better graphics available now. In Morrowind every cave felt different to me based on the layout. I could find that further in the cave was a semi flooded room with a wooden platform for smugglers to sleep on. I could find lava pools and sixth house abominations. I didn't notice the reused cave wall texture. In Skyrim it is very noticeable when the dungeon has the same lighting atmosphere and wall textures and enemies.
Probably a lot of this, Morrowind walls was so blurred you did not notice it, but if you have an detailed texture with features you will notice it repeats.
Only weakness in Skyrim is that the dungeons are pretty linear.
Hand placed unique loot is an general bad idea at least if it's very good, people get an walktrough from the net on how to get this items then complains that the game is to easy and to repeatable.
Respawn time was increased to 10 days so people should not farm Rockmilk cave and complain that all dungeons looked the same.
Problem in Oblivion was that some dungeon features repeated to often,