oblivion is enjoyable but in a different way than morrowind, its more accessible and presenting.
many things in morrowind require more efforts from the player and i prefer that. when i first play the game it was enjoyable to figure out how to travel from place to places, and reading all the books about the gameworld theology system were extremely interesting.
Oblivion was extremely boring, gameplay and story wize the whole way through. Since i watched lord of the rings movie i knew the outcome before long. But I beleive it is very sucessful for many reasons. I really enjoy the graphic, so I only open the game once around and walking around to see the nature, its relaxing to the mind. But this is mainly due to the mods that really enhances the visual though, without them the game is bland. This is an important factor for this game, it has a very big modding community, so if you haven't try this out i recommend it. It also has an excellent presentation exspecially the ending, and the fighting system is vastly improved, i love using the bow in this game. Another sucess is the personalization of your characters, since many of the fanboys loves getting mods to make their character look like a half goth half anime character with big eyes balls unfocused pupil looking like its on cocaine. All they need to do now is provide a little more depth for players who wants more challenge, then it would be a perfect formula.