"Definitly NOT just an expansion for Halo 3!"
I was apprehensive to buy this at first, I already had Halo 3 so I was buying this pack to take advantage of the relatively cheap game/controller combo, now i am glad my old controller was getting past it because it lead me to one of the most enjoyable games I have played in a long time.
Fans of the Halo Series will love this, and people who thought that Bungie had lost their way after Halo 1 will be pleasantly surprised by the way the OSDT team has brought back some of the features that made the original game fun. Sniping pistols, health that doesn't just come all the way back and what sometimes feels like an infinite number of enemies make for some exciting game-play and the voice acting cast and war-torn city make for a very atmospheric environment.
While it may be over quickly, you will come back to this either on your own or with a group of friends.