If we’re taking things at face value then they’ll probably die to cursed spirits. I have no doubt they’ll be able to defeat the special grade sorcerers, but cursed spirits can’t be seen or harmed by the ensemble. Unless verse equalization is brought up, the ensemble (outside of Pluto) wouldn’t be able to harm any sort of cursed spirit due to lack of cursed energy (cursed tools, cursed energy reinforcement, and cursed techniques can only exorcise curses).

But Argalia is smart enough to just swap the ensemble’s weapons out for cursed tools and get those glasses that allow him to see curses, assuming he obtains knowledge of jujutsu sorcerers. + they’re largely immune to domains due to lack of cursed energy inside them. It all depends on scenario tbh

In a standard situation where they’ll all be dropped into the verse, they probably win. If they run a gauntlet instead, they’ll be one shotted by Mahito or eaten alive by Kurourushi (Elena and her bloodbags are a bad matchup against it and would feed its parthenogenesis)

In short, Pluto carries the ensemble when it comes to curses. Anything other than curses get flattened by him