On top of the criticisms people have said before.
Can we just all appreciate just how well the new generation can totally surpass the old generation? Haha, I mean really, they are so surpassing them. I mean Kaguya is so weak compared to Sakura, after all, they are what... 50 generations apart? maybe more? Sakura must be a God compared to Kaguya. (Sarcasm)
Kishimoto really doesn't know what lesson he is trying to convey... Actually there are no lessons as far as I can tell... One of the lessons he has hammered in is that the new generation will always surpass the old one, yet time and time again the final bosses are from past generations, where they have extreme advantages.
The worst part is that, the only way they stood a chance against Madara, is if they got a mass power up from the Sage, and now, even after the mass power up from the sage, Kaguya, the MOTHER of the Sage, proves to be EVEN STRONGER than he is. -facepalm-