An ongoing issue with Torghast has been the scaling issue with the bosses; they often act as a wall that you either can or cannot surmount no matter how skills you are at your class. I find this to be a just outright poor design. They designed these fights like they were dungeon bosses; things that you can beat based on numbers, with some basic mechanics, and a fair bit of stuff that cannot be avoided. Which is fine for the most part. But when you're scaling your content based on random powers, you get instances where you're being killed in a few seconds with absolutly nothing you can do. This is made worse by a mechanic where the bosses get stronger in time.
I feel the issue here is a fundamental failure in how they went about designing these bosses in the first place.
They should have been designed like Brawl Guild or Mage Tower fights; fights with mechanics that can be gamed in some way. Since the scaling issue is more so for twisting corridor, I feel like if anything this design should have been applied to it. I dont think people would have any problem with it having its own bosses; that way you can at least plan ahead of time for the 2+ hours you'll be spending in the place.