alt Hacker NewsYes, but never in the absence of the Bungie servers. It did have a full sequential single player campaign, but parts of the single player campaign took place in shared instances where the user could see other players running around the map. The single player campaign could also be played cooperatively with other players in the same 'fireteam' if desired, but that was optional.
Sure, but SPC still took place in the same shared world. It wasn't like there is a single-player vs multiplayer in CoD or BF. The only way to make those campaigns work offline is to remove all drops from them and remove co-op pieces that aren't optional. Doing a strike and joining right at the end of it, missing the entire story of that strike, was like a mandatory experience for D2.