The Elder Scrolls IV: Oblivion (Xbox 360, 2006)

To keep it short and simple, if you had free time before this game, you will not after you own it. There are endless amounts of features that you can add to design your character. This is truely the next generation of RPG, and the best RPG on Xbox 360. The number of different quests that you can play are endless, and Xbox Live is constantly releasing content to download to keep the game fresh. It is recommended that you buy the strategy guide, as it is very useful when navigating through the large area.

Some detail about the game: Do not waste your time fighting the guards, they are usually about 10 time stronger than you, and will continue to call for help, even if you are not in a city. Your best bet is to run away or bribe the guards if you get caught stealing. Be sure to save often, you never know when something bad may happen, and you do not want to have to go to jail and lose any items you have stolen or earned.

Only negative I saw about this game is that it is not available for a massive online RPG, but it is still worthy to invest a few hundred hours of gameplay in.