Fable II
If you own a 360, GET THIS! I've put about 10 hours play time into it so far, and it really is a wonderful game. Open world and interactivity with every NPC such as Oblivion, without the odd, boring quests that make up the bulk of that game. It has kept me interested the entire time. Even the jobs you can get are alright. You can even buy almost every property in the game, and draw income from them.