I thought Cyrodiil was amazing to look at.
I admit that I was amazed by the
graphics for the first several hours I played the game, but the..."sameness" of everything, for lack of a better word, really started to bother me after a while and still bothers me.
However, the Shivering Isles were a really interesting sight.
I thought the main city was interesting, and most of the items and armor and such, but I was never too impressed with the Shivering Isles landscape. To me, and this is only my opinion, but
to me it seemed that adding giant mushrooms to the game was Bethesda's way of saying
"There! You happy? Now shut the hell up!" to everyone who complained that Oblivion's world was boring compared to Morrowind.