Play fallout NV, it will make you cool.
Get GTA. It keeps you amused for hours. Days even.
Team Fortress 2 is pretty amazing on the Xbox as well, it's not that good in comparison to the PC version, but you could make due.
I would go for either a fun sports game, like NCAA Football, or MW3. Both are fun and take your mind off of other things!
Mass Effect 3 is a really good over all game.
BF3, Skyrim, Trials HD. These are really good games that will keep you gaming for a while. There's also Trials Evolutions coming out in a couple weeks that you should defiantly look into
Shadow Complex. Or Just Cause 2
They are awesome games!
Play Mass Effect trilogy. Trust me, you won't regret it.