Doesn't the general fandom agree that the quality of the Manga went down after the Pain Arc? I personally loved it (leaving out the confession of course which SP twisted and changed in every way) and thought that Pain/ Nagato was the last good villain the manga had.
I didn't think the confession was a big deal if anything I thought it was gonna play a huge part at Hinata's future development, but alas it was never addressed again.
After pein arc we had
Kage Summit arc, which was bad mainly because cringe-worth team seven drama, Naruto acting like a stupid, Sakura acting with even bigger stupidness, Sasuke crazy rampage going nowhere
Then we had confining the jinchuriki arc: which was pretty so-so thanks to Kushina appereance, unfortunately it was a setup to the worst of all arcs
War arc: convoluted plot, ressurected enemies, lack of focus, lack of impact, lack of mortality, asspulls at any given time. The worst arc, Kishi could have done a real ninja war, Akatsuki could have swayed some small countries for its side for example and used rogue ninja, instead of fodderising white zetsu