Nice poll that covers majority of the Havoc aspects. I appreciate your effort!
I would have one remark. I answered that the mode is “too hard” but my exact opinion is that it is poorly balanced resulting in artificial difficulty. With proper squad you can clear the maps pretty fast and relatively easy, but several design choices, mostly the insane damage from standard ranged enemies, omnipresent corruption, green goo etc. force you to play with certain playstyles, resulting in a game which is “too hard” if you do not play meta. Also godspeed with randoms!
I cleared with my mates all weaves in Vermintide 2 and in my opinion it is the same core issue of “artifical” difficulty. In that mode, any weave above 100+ had very stale party composition and gameplay, as the insane damage scaling rendered majority of the classes literally unplayable. Play meta classes and tactics or suffer. Some forum goes made excellent summaries on that topic and the current state of Havoc reminds me of that situation.
Not to mention the hidden mechanics, which is already already a well-known classic move + the unholy mixture of the party finder and the demoting feature, that can turn every random lobby into a basin filled with toxic sludge last seen in the Convocation of Decay.
Still, I plan to finish the mode with my mates, because a part of me likes the challenge, but currently it is not offering that much replayability for me.