Serious talk.
This is much bigger than Sanji.
Usopp was reduced to cry his way over everything. He freaking defeated Sugar by crying. No more "brave usopp" moments like when he defeated Perona, or when he stood his ground against Mrs. Merry Christmas.
His little mental speech to Nami when Ulti was threatening her is a direct contradiction to his character in Alabasta.
Nami and Robin have been reduced to fan service machine. Nami got a fucking sentient expanding dildo as her PU.
Robin new form is cool and all, but naked. After all, the fan service can't stop because of merely PU.
Franky has some great moments still, thankfully. Brook completely lost himself on the pervert half of his personality like Sanji.
Chopper?
Most of Zoro "funny" gags are related to the little dispute with Sanji. He had SO MUCH MORE moments with other crewmembers before.
Luffy died and Nika was reborn last arc, so I don't even wanna go there.