Take it back and buy one of the following (assuming you don't own one of them):
Fallout 3,
Fable II,
Resident Evil 5,
Mass Effect,
Soul Calibur 4,
Or, you can choose my personal favourite option, and buy some Microsoft points, then buy the following games:
Banjo Kazooie,
Banjo Tooie,
Braid,
You should have played Banjo already, if not, you lack manliness and should repent your sins.
Braid is awesome, not the longest game but it is the best original XBLA on the 'box and is so awesome I'm getting excited in my pants just thinking about it.
