Near perfect game, very approachable RPG. Hundreds of hours for your money.
But to get to the meat of this review Oblivion is a massive game with hundreds of areas to explore, a great story and lots of side quests to keep you going. Even if you've done all the quests all the special items and things to be done make it go on for hundreds of hours. I mean how many games give you so many options. The guilds are a great feature which add alot to the game. The dungeons and caves are a bit repetitive in style but this doesnt matter because there are so many unique locations as well.
This game is class and is one to never give away because you can do nothing but solid playing for a week and it can all feel a bit overwelming but this just means its a game that you'll need to play over and over again to get the full experience.