Reason Oblivion is better is because you have cool swords and you travel to other dimensions. I wonder when the next tes comes out. I think I read it would be Elsweyr, home of the khajiit. Maybe there will be bits of the black marsh in there too. I hope they make it so mods with oblivion will work with it too, as it would take a while to get all the cool stuff I have into a whole new game if they didn't.
