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bungie would tell you that screwed up in making Halo 3 ODST because there is no form of games and because you can not play with more than 4 players
odst was a small side project meant to be an expansion of halo 3, not a stand-alone game.
Who says they screwed up? They sold millions of copies, generated a ton of money, and got rave reviews for the game. Sure people differ in opinions on the games quality, but that occurs in every game.
Not my favorite halo game, but I wouldn't say they screwed up considering how small of a project it was.