All RPG fans must either denounce being a fan or own this game.
In Oblivion, it's the little things that make me like it. The new map functions, more preset, good characters, mounts to ride, and journal updates.
Though my flaws with the game are simple as well, no minor skills, less information on each race so if i want to have my "perfect" charcter i actually have to look at the manual, and well the major let down is not having the manual references in the menus.
Bottom Line: If Morrowind bored you don't buy. If you like expansive, lush, deep, rich and incredible worlds buy it NOW.