IGN review scored it 6/10 "cool fight scenes can't make up for a meandering story"

I see a lot of people here thinking that the plot is missing/irrelevant in shibuya.
Shibuya incident is very much a setup arc. Not only that, but JJK's plot is hidden behind context clues and words it's caracters say. Most of the story is revealed through symbolism. Gojo and Sukuna being like Modernism and Post-Modernism, the whole of Yuji's character arc can be understood if you understand the weight of Yuji's words when his ideal of dying surrounded by people changes into: "And maybe a hundred years after my death, the meaning behind my actions will become apparent. In the grand scheme of things... I'm probably nothing more than a cog. But I'll keep killing curses for as long as I can. That's my role in all this."
Connect this for example with Gojo's ideals and you get the true story of JJK, the sorcerer society and how it reflects on ours. (If you do not catch the obvious parallel between Yuji's development and how a hopeful person can be crushed by office work then you really have no say about whether a plot is good is not.)
That in my opinion is what makes JJK great, since these kinds of connections can be made with any plot relevant character, for example, how everyone who acts like Sukuna gains and wins, while everyone that acts unlike Sukuna would, loses: Mei Mei acts upon her selfish desire for money and thanks to that escapes Shibuya unharmed while Nanami, hoping to relieve Yuji of too much responsibility says to him: "Itadori.. You've got it from here." creating a burden on Yuji that he recalls as one of his responsibilities even at this point in the manga.
There are obviously many, many more things like this hidden in the JJK narrative.
Yes, finding these details is not something you can do as a causal reader/watcher so I cannot really blame anyone for not getting that. And most JJK fans probably just like it for the cool action, but there is so much more under the surface it's actually crazy.
And if you complain about the general plot as well, you are going to be so dissapointed when you learn people say Monster is good even if it is revealed who the murderer is on ep 4.

I see a lot of people here thinking that the plot is missing/irrelevant in shibuya.
Shibuya incident is very much a setup arc. Not only that, but JJK's plot is hidden behind context clues and words it's caracters say. Most of the story is revealed through symbolism. Gojo and Sukuna being like Modernism and Post-Modernism, the whole of Yuji's character arc can be understood if you understand the weight of Yuji's words when his ideal of dying surrounded by people changes into: "And maybe a hundred years after my death, the meaning behind my actions will become apparent. In the grand scheme of things... I'm probably nothing more than a cog. But I'll keep killing curses for as long as I can. That's my role in all this."
Connect this for example with Gojo's ideals and you get the true story of JJK, the sorcerer society and how it reflects on ours. (If you do not catch the obvious parallel between Yuji's development and how a hopeful person can be crushed by office work then you really have no say about whether a plot is good is not.)
That in my opinion is what makes JJK great, since these kinds of connections can be made with any plot relevant character, for example, how everyone who acts like Sukuna gains and wins, while everyone that acts unlike Sukuna would, loses: Mei Mei acts upon her selfish desire for money and thanks to that escapes Shibuya unharmed while Nanami, hoping to relieve Yuji of too much responsibility says to him: "Itadori.. You've got it from here." creating a burden on Yuji that he recalls as one of his responsibilities even at this point in the manga.
There are obviously many, many more things like this hidden in the JJK narrative.
Yes, finding these details is not something you can do as a causal reader/watcher so I cannot really blame anyone for not getting that. And most JJK fans probably just like it for the cool action, but there is so much more under the surface it's actually crazy.
And if you complain about the general plot as well, you are going to be so dissapointed when you learn people say Monster is good even if it is revealed who the murderer is on ep 4.