I have the exact same sentiments especially when Oda build up this specific arc since Punk Hazard. He literally had over 250 chapters of build up for this arc and what did Oda do in the first 70 chapters of Wano? More set up of Wano. I don't know why any author needs 300 chapters of set up. Post time skip one piece has literally become 80% set up.
To add, one of the worst things that made me mad was they separated the crew, WCI just got done and Oda who has a chance to build up plot for Robin, Franky, Usopp, Zoro instead goes Nah im going to have Luffy jump in on the second chapter and ruin everything
So many plotlines in Wano pre Onigashima that's terrible
Onigashima plotlines that are also awful
Mix those both with terrible pacing and you leave yourself with an upset fanbase.