This is incredibly disappointing. One of the things that really makes gw2 stand out from some of the other mmos that I have played are the metas and open world events that anyone can join. Everyone doesn't have to have top tier gear and perfect rotations to do the event. For all the other metas and group events as long as you had enough people and a commander willing to explain the mechanics the event typically succeeded, but even if it it didn't you still got decent rewards along the way for the metas.
As almost everyone before me has said get rid of that atrocious rng with the boss mechanics. Who on earth thought that was a good idea.
If you insist on making the final meta of this expansion "hard" at least add an extended timer with different tier rewards. Stop wasting everyone's time. Having a two hour meta with a high fail rate, rng mechanics, and a group of 50 other random people is not fun. I have played the other metas countless times and almost always had a positive experience. This one I have tried 5 times, and I honestly never want to do it again.