Ive been playing MMOs since Ultima Online. I have never seen a situation where a required mission had people stand in line one by one to turn in. And if somebody tried to turn it in at the same time it would glitch. In this case a laptop had to be logged into and to get it done there were on avg 12-18 people in line single file trying to attempt it. Funniest thing I have seen but also the most annoying at the same time. A really bad bottle neck that should never have happened.
That picture a few posts up is what happened.
Once past it the game is smooth sailing. Just a really weird design decision imo.