The issue is that Oda's writing became worse when it comes to post-ts female characters, especially the likes of Robin and Nami.
Sure, both get their moments but if I think about their interactions with Momo, Oda also butchered their character with stuff like that. People make fun of Sanji but imo Nami, Robin and especially Usopp weren't handled better (in general).
Big Mom started out great, until Oda started clowning on her consistently. She's apparently comparable to Kaido but I've seen none of that in Wano. Compare her Misery with Kaido's Blazing Bagua, there are levels.