2) The multiplayer part is what makes this thread pretty much. The single player is just an asset that we also talk about while it's still "fresh". Yes, the multiplayer is why it has "high rates". I cannot answer your question if the single player alone is worth it or not since this depends on personal taste. I cannot even tell you from my own viewpoint as I play the game for multiplayer, but I had fun playing the campaign. I do know 2-3 friends who got it solely for the single player part though.