I secretly liked most of the Halo 3 campaign, especially on Legendary in coop. The problem is that the game is two years old, the campaign isn't that long and the multiplayer on the disc is useless because Bungie requires you to have all the maps to play any of the real multiplayer playlists. ODST was dirt cheap and had a brand new campaign, Firefight mode, which looks to be fun with friends even if you're one of those bold people who hate Halo, and the second disc with Halo 3 multiplayer and all the $40 worth of DLC for it.