I know where puki is coming from with the dungeons. Every one you go into has the same textures and areas. It's like they developed the dungeons using a generator with a limited set of room meshes or something.
Certainly looks like the dungeons/caves/forts are made of 'rooms', they all look alike.
The game is huge, not that I can compare to morrowind I've never played it. Just walk off into the mountains and you will find forts/caves/shrines and the like dotted all over.
It still has the Wow! factor for me,take in the atmosphere the sights the sounds the music its a wonderful thing, makes you feel quite humble at times.
I found that following the main plot of the game got boring, so I created a new character and then wandered off going where I wanted just for the fun of exploration.