This is really unsettling; I was completing a quest (I'll try to not include many spoilers) early in the Pact storyline to protect an NPC in the crypt under Devon's Watch... I get to the location and others have already finished the event that is supposed to happen.
My quest is immediately updated to enter a portal in the area, and I head through it, since the previous step no longer exists for me. The area on the other side is also 'complete' (area is completely 'cleaned up' of enemies etc). Now everyone is lined up cheering for me, and side conversations talk about how I am their hero.
This is ridiculous, since all I did was walk from A to B to C, all the in between steps had been completed by others.
Hopefully they'll make it so that individual progress instead of environment state updates quests, especially for the main story, but that might be a big ask (but I think it is a necessary one).
Edited by Shemhazazi on 30 March 2014 20:42