@akshaybharwani The game is build in a mix between single player and multiplayer. Either you can play through the game alone, go co-op, or go mix it up. It's not that you have to go the main menu and change between the multi and single-player, it's all happening right in the game. It's actually quite amazing, and they defiantly encourage you to play with other players. But even though we did the "single player" part 3 friends in co-op, it's really nice. And you can go together to the dark-zone (which is the "real" multiplayer part) and fight other players together (or fight each other and go rouge).
I am a big fan :-)
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