My experience so far with the Instance:
1-2nd try:
-quite some confusion how to get through the 1st maze in the most effective way
-wtf how to get solo through the mobs when you get split up
-how big is the second maze?
-how do you even kill the boss?
Later trys:
-can we please clear all the mobs, i need tentacles
-wait there's still 5minutes left after the boss kill?
In the end it mostly comes down to team composition(including a good mix of roles, decently geared), communication, experience with the instance.
I watched the random group that was running today, and saw some issues with people not knowing what to do.
But even then they reached the boss in time tho they didn't kill it.
If they try a bit more and figure out the strategy to tackle the maze & the boss they have a good chance to clear the hard mode.
I can see how people can get annoyed by the 1st maze, but there seems to be some kind of pity after entering x portals so it's pretty much doable if you always take the nearest portal. Also you can utilize classes like meister/rebel/inquisitor who have strong movement skills to scout ahead and make up time that other might need in the 1st maze (tho not really necessary).
In the end i think the istance is pretty okay as it is and i enjoy that you need some teamwork of different classes to tackle it. As improvement for others i might suggest adding a lower pity for the 1st maze portals or some other mechanic that shortens the time some people have to walk in the 1st maze.