If you thought Red Dead Redemption's single-player looked exciting, wait until you get a load of the extensive free-roaming multiplayer Rockstar has cooked up. Posse up!
I loved the free play multiplayer mode in Grand Theft Auto, and Red Dead Redemption's Free Roam multiplayer is a lot like that at its core. You and a bunch of other cowboys, riding the range. But instead of being a standalone game mode, all other multiplayer activities are tied into this Free Roam multiplayer. Form a posse and go hunting, or participate in team deathmatch shootouts, or just ride around, looking at the pretty scenery. It's all up to you.
That's the sort of freedom I can get behind. That's the sort of multiplayer that pushes Red Dead Redemption past a 'must buy' to a... I don't know, a 'really must buy', in my book at least.