I'm not paying for Halo 2. I like Halo as a series of games, and I'm giving them my money, like I have in the past, because I trust their ability to make a game.
I liked Halo 2, but come on. If a primary selling point for buying a game is getting the same exact experience every time, you may as well just have a Halo 2 lan party. --- I look Death in the face and say, "Whatever, man."