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Dunno about PS2, or what multiplayer modes it'll have.
Oh, and if I had to choose one, it would be Conflict, but Freedom Fighters is looking good, so I migth just have to pick it up as well.
The multiplayer game is the same on all platforms (except PC which has none), it's pretty restricted: only 3 maps and 1 game mode (King of the hill), but as someone said, it is primarily a single player game, and a good one at that.