Temple of Sethraliss changes were definitely great, though slightly trivializing bosses too much (can’t possibly mess up anything on Avatar of Sethraliss anymore, basically making it an NPC to get a few free % at the end by pulling trash in last phase).
In Kings’ Rest, The Golden Serpent’s Spit Gold ability still does far and beyond too much damage, doing ridiculous things like ticking for 70% of a player’s health on high tyrannical keys. Same thing for Kula the Butcher’s Severing Axe. Both need a huge nerf. Spectral Berserker’s Severing Blade does stupid amounts of damage on high fortified keys as well and is far too punishing for being relatively common trash mobs in its hallway. All of these things need a lot of attention, everything else is practically meaningless in comparison.
As for Siege of Boralus, changes have been much appreciated as well. Still not a fan of 7 minute boss fights in dungeons (tyrannical Viq’Goth). I personally don’t see the benefit in fights like these existing at all, they’re just a bothersome drag, regardless of difficulty in execution. No fun in playing a boss like that, especially when a ton of small things can just ruin your key instantly. Would suggest cutting Gripping Tentacle health by a lot and compensating with added difficulty in any other layer.
Underrot changes have been great as well, really fun dungeon all around with lots of room for coordination, lots of big pulls, strategic cc, healer attention via dispells and purges. Elder Leaxa no longer spawning multiple Blood Mirrors makes it a simple interrupt check, which is a fine thing.
Other than recently changed dungeons, Shrine of the Storm still proves to be hardly worth the effort for being such a long run with ridiculous boss health across the board and tons of oneshot or near oneshot potential on multiple bosses and trash packs, regardless of affixes.
In Waycrest Manor, right from the beginning your key might be doomed by bad RNG (door openings). Terrible design and should be removed/made static. Lots of issues with mobs running through walls, pulling through walls or entire floors (pulling Matron Alma through the floor, basically ending your run instantly).
As for affixes, some combinations should straight up not exist (Fortified+Teeming making trash take forever, even with 0 difficulty, which just isn’t fun at all and a waste of time).
Quaking and Bursting make you go insane as a healer, being kept from drinking all the time, wasting time yet again for no reason with 0 difficulty added. Unlucky Quaking timings can just straight up kill someone with no counterplay if some near oneshot mechanic happens at the same time.
Explosive is not a fun affix all around, which has been the community perception since forever.
Personally, I’m not a fan of Fortified and Tyrannical existing at all, and would absolutely prefer them to not define a week or key’s worth on its own (aka not exist at all). Would love to see some sort of experiment of having a week on Live servers or PTR at least without these and hear about what players think about it.