We've waited like, 15 years for Kuma's backstory, I can handle Oda taking his time with it.
One Piece is a series with a ton of characters and places in it, so, sometimes it's a slog to read weekly.
This is probably one of the best paced flashbacks in the series, we've gone through the entire man's life almost in like, 5 chapters? While also getting some God Valley, Revolutionary stuff, introducing multiple new characters, and also getting Bonney info and moments?
People are just frustrated from the breaks, but this is a necessary chapter to explain what happened to Kuma.