I voted OP, merely because the event is undeniably more difficult than the other end events on the same difficulty. The sheer number of Elites and Specials is pretty high (maybe not the highest of all but still), and that in combination with the tight movement space, yet the constant danger of being surrounded, the ledge where stuff can sometimes pop up out of nowhere, the possibilty to be easily split from your teammates because of the ledges so you can’t help each other, and the visual effects covering encroaching threaths as well, makes this event harder than other endings where you often have more space, a better possibility of avoiding being surrounded, and better sightlines.
Do note: Whether that means this Event needs to be tuned down, or the other ones need to be tuned up instead (or a mix of those options), is a completely different discussion!
On another note: I would like to express my appreciation for this post! These kind of things where somebody from FS asks a direct question about something so we can give focussed feedback, while knowing it is at least heard, is exactly the thing we would like to have more of here! Please do that more often!