Naruto ending is not that bad, if you take out Kaugya's appearance and just let Naruto / Sasuke defeat Madara with their Six Paths powers, and then proceed to have their own fight, it's a pretty okay ending for a shounen. The Kaguya part is the shitty part, but in my opinion it doesn't mess with / ruins the past arcs or anything, like AoT just did by showing how Eren's motivations were pretty trash and the build up for a solution was to "free Ymir from her love of King Fritz" and that Mikasa did that somehow, not even Isayama himself knows exactly how she did that.
AoT is the worst for me if i compare it to Naruto, i haven't watched the other series to the end, dropped all of them before the end (Bleach, Nantasu no Taizai, Fairy Tail)