I got Halo ODST yesterday and beat the ccampaign this morning, I gotta go back and play the ccampaign a few more times, I don't know how I feel about it completely, but I'm sure am having fun so far. The ccampaign, firefight mode, the halo 3 maps, and polish equal a worthwhile purchase.
Over the last week I've bought 5 new 360 games. I sold 16 games out of my collection last week, to put some funds towards these 5 games was able to pay off Halo ODST, and Batman:
Halo 3 ODST, 360 (Got this via gamestop so I got my Johnson character)
Batman Arkham Asylum, 360
Crackdown, $10
Fear Files,$15, 360 (Useing this as a test if I want to buy the two games in the main series)
Puzzle Quest, XBLA, $5