Not surprised. Bethesda certainly knows to please their buyers with good modding tools and support. I have about 100 mods on Oblivion, in some areas it looks better than vanilla Skyrim maxed out. The levellng system is sorted, the UI is sorted, the music is improved etc. I think it's a great thing as long as you don't ruin the game with weirdo mods ("all helmets are pumpkins" etc). Really adds to the longevity of the game.
EDIT: Some screenshots of my GTX 260 running MODDED OBLIVION. Always 30+ FPS. I think it's great for a 6 years old game, and with a better card it could be pushed much further.
Sorry that I only got shots of trees, but I removed my install now that I'm getting Skyrim so these are leftover pics.Edited by Oystein - 5/3/12 at 9:38am