Which ones do you think have remained so?
Not necessarily utter trash, but generally poor choices (excepting the brand new specializations that haven't seen a pass yet):
Corpse Eater: penalties too severe and hard to use for the benefits.
Mage Slayer: severe penalties make it often a trap choice.
Stormspeaker: not usually mentioned because it's multiclassed, but single class chanter Tekehu is ready bad.
Beguiler: worse at its described role than Ascendant with no real upsides.
Wild Mind: lololol.
Black Jacket: I don't know that it is underpowered given a relatively minor drawback, but the role that this was envisioned to fill was nerfed hard enough that it isn't really attractive anymore.
Shattered Pillar: honorable mention. It does have a niche, but has so many drawbacks that even in places where you might otherwise see it vanilla monk is better.
Sister of the Reaping Moon: not too bad, but almost a strict downgrade from vanilla monk.
Darcozzi Paladini: while every other Paladin order has found a mechanical niche, Darcozzi basically exist as a no frills roleplaying order. Nothing really to advise it here.
Brotherhood of the Five Suns: another NPC class - actually worse than a theoretical vanilla paladin with no special benefit.
Priest of Eothas: ultra generic spell list makes it's only niche an ultra second class focused multiclass, and I don't think any of those are particularly good.
Priest of Berath: similar to the above.
Priest of Gaun: a bad version of Eothas. At least Blessed Harvest is good for Maje Isle?
Sharpshooter: almost a strict downgrade on vanilla Ranger. Excessive drawbacks for minimal benefits.
All wizard specializations except Evoker - penalties are excessive for very minor bonuses. Many of these don't scale appreciably with power level.
In addition, rogue and chanter have powerful, generic enough subclasses in trickster and troubadour that their vanilla versions are almost always a poor choice.