And I don't really care if the reaction chapters are about how good Izuku is at analysis - they're still whole fucking chapters about how cool the characters we're supposed to like are and how good they are at doing shit and ooh, isn't this so cool.
In addition, pretty much every chapter following since the reveal and defeat of the Turncoat has felt thoroughly phoned in. Nothing stands out or is memorable beyond.
Bakugo gets slapped with the idiot stick until he pretty much stands around or rages aimlessly and Todoroki has to step in and instantaneously does a better job than any other hero (including himself) has managed the entire fic, but by that point it's too late.
The villain team is equiped with plot armour several miles thick, and not even the 15th objective is interesting. I think 15th should have been focused on many many chapters earlier with priority to compensate for the hero team's impotence with the threat of the villain team imploding, but as it is it's a tacked on detail that only compounds the dud ending. There's no sense of victory there or even real camaraderie for the winning team, and even the celebration sucks.
The ending. The actual ending. Spoilers maybe? said:
"WE NEED FIREWORKS!"
Jiro hit a button, and from every speaker still in the city, a song began playing.
And in the center, the villain base exploded in bright green red and gold flames with sparks that lit the sky.
And on the hill, the Villain team laughed and cheered.
What is this supposed to be?
It isn't a celebration, it's a completely uninvested observation. Following it with a literary stinger at Kamino Ward to set up a probable sequel is just the worst way it could have ended, because it isn't an ending and it robs any (non-existent) satisfaction for the win with a giant neon reminder that everyone is on the verge of getting their shit fucked up badly.
It seems completely and utterly tone-deaf in every respect.