My Oblivion bitterness started after I had finished the boss battle. It was just so... bad. Then I realized what the **** I played there for 60 hours (incl. addons). Since then, I never touched it again until Nehrim, which I found much better than Oblivion... Never finished it though, because as stated already, some of the quests are so bad and the performance isn't pretty good either and so on and so on.