The current Craglorn adventure zone is unintelligent, unintuitive and is wasting time for all four people in the group. If Zenimax is satisfied with their way of going about adventure zones then I can only add to that the general opinion of fellow players I've grouped with is "they surely cannot be serious..."
Some of the quests are so long and so spread out across the map that unless all four group members begin the quest at the same stage they are forced to start at the beginning anyway. Example would be starting the quest in one dungeon which is impossible to solo, clearing it (and it takes some time since this is not a speed run), advancing to a next stage, going across the map into another dungeon, clearing it, picking up a new quest objective. Unless your group is dedicated you will spend an hour or more. At some point for one group of four people or another someone will have to leave and a replacmenet will have to come in. Because of the way things are at the moment either that new player has to go through the previous quest stages (which are either impossible, or nearly impossible to solo) or the three other people will have to go back.
Why can't the quests be split into shorter individual quests? Why the need of spreading them into what it is now? So far I have been able to complete no more than five quests that need grouping up. The others I've picked up we failed to complete because inevitably someone is so far advanced that he cannot push himself to go all the way back and repeat the same stage for nth time. Also people don't want to invite people to join a new person if he's not advanced to the same stage of the current quest.
At the moment Craglorn has more low level veteran players who are farming mobs to gain quick experience. At the same time it is difficult to group up with four people of near max level to competitively do dungeons and quests.