The Naruto arc is not necessarily bad per say, its problem is its ending in majority.
This last arc lack a bit of emotional punch, but the majority is solid. The main problem arrives with the ending moments and the last antagonist : Kaguya
The revelations and development surrounding her moment lacks plantings. With enough plantings in the story (mostly foreshadowing and prophecies) you would have been able to create a great development. But its this apparition felt unearned.
A story with a lack of plantings will fail, always.
Aside from that, its not really that bad.
This last arc lack a bit of emotional punch, but the majority is solid. The main problem arrives with the ending moments and the last antagonist : Kaguya
The revelations and development surrounding her moment lacks plantings. With enough plantings in the story (mostly foreshadowing and prophecies) you would have been able to create a great development. But its this apparition felt unearned.
A story with a lack of plantings will fail, always.
Aside from that, its not really that bad.
The last antagonist is Sasuke. How many chapters was Kaguya even around, she had like 5 lines, nobody cares. Honestly they should have just sealed Madara, but then he wouldn't have gotten closure. So she spat him out at the end to aknowledge Hashirama's path and die lol.
Even Naruto himself called her mid.