The world building is the easiest thing to bash. Some may argue the concept is unique but its execution is sloppy. But attributing the idea of collective unconscious to the author is giving him too much credit. Some other media e.g. Persona already did a better job using it. So, human negative emotions are the source of cursed energy and this energy creates cursed spirits, and people haven't discovered this energy as well as spirits for thousands of years even though this stuff regularly claims people's lives. BUt pEoPLE caN't SEe tHIs ENErGy! Like yeah, sure, people also can't see radiation either and, nevertheless, we are aware of its existence and its affection. In Japan highschoolers keep people safe, as they always do. And it was unknown what was happening in other countries, and only at the end the anime offhandedly mentions how little cursed energy other countries have without explaining why, despite a lot of them having a bigger population. That could've been explained, for example, by stating that the idea itself of collective unconscious is mainly spread in the East in contrast to the Western civilization where individualism is predominant, but it would've been too smart for JJK I guess. Also all cursed technique are overly complicated, there are no rules nor any limitations: sorcerers can easily create energy out of thin air and then easily disperse it. So, it's more convenient to tread all techniques as magic.
The story eeeh... it has a little of it. The second arc, which is like 17 episodes long, is a series of fights back to back, that's it. And given the quality of the story of the first season it isn't bad, double down on the best the franchise had: action; and get rid of everything that get in the way of it with the exception of dramatic scenes, which is kind of whatever, JJK isn't a drama to be honest. The first arc contain most of the story and it's on the same level as the first season.
This season could've been the best anime from a pure visual perspective, but after a certain episode the quality starts degrading reaching the lowest point in the last episode presenting the aftermath of the arc via a slideshow presentation. Although, even that lower quality still surpasses the majority anime adaptation, but the difference is glaring, nevertheless. Worse the shot composition, worse the cinematography, the direction in non-battle scenes has just gone, even the action scenes were affected in some degree. The first 6 or to be generous 12 episodes is peak of the adaptation and the second cour should've been delayed. Also, the ost isn't mediocre but it just doesn't contribute anything to the fights.
With all that criticism in mind, there is just nothing better than JJK if you just want to see some crazy action. The closest thing is probably demon slayer but its story is no better and its characters really made me root for the demons to kill them. JJK2 was lucky to get so much care, but the animators, unfortunately, paid for that with their mental and physical health.
