Is there a sort of system or logic behind what parts of quest objectives can be done per person in your group, and which ones you can all contribute to?
E.g.,
1) in the Alik'r Desert public dungeon quest where you need to gather relics, if you are grouped up with someone you can't share relic drops. You each need to go and get the items, (which vanish after one person gets them!) making the quest take actually longer to do in a group!
2) In the Craglorn Mage questline (The Shattered and the Lost), where you have to gather the sight gems - each person needs to grab all 3! It would make far more sense to split your group up into 3 people, and then go and get them altogether.
So yeah, is there any sort of logic behind this system? I get they don't want people to just be able to group up and get free quest turn ins - gating the quest by stages seems like a reasonable in-between (For the Shattered and the Lost, if you want to get to Elinhir quest bit you need to do all the prereq parts, but if someone is gathering sight gems in your group, you don't need to get them. Or having to talk to the NPC for each quest stage update is another way to stop people from getting free quest completion)
For an MMO, it seems especially difficult to do stuff in multiplayer - you can't really work as a group, its just a bunch of people fighting in the same area sharing EXP.