I think they should have described it as co-op instead of multiplayer. Actually I think they did describe it as co-op but somewhere multi-player worked into the description.
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Anyways dedicated servers make no sense (from my perspective). The intention is for 1 or 2 people to play the game - not for 2 people to randomly find themselves and play part of the game and 2 more people randomly find themselves and advance the story and so forth.