Start of Fishman Island was good, first island after timeskip, long awaited fishman island etc.. until everyone in island kept shouting "Mugiwara, Mugiwara Mugiwara" then the awfulness of Hody Jones as a character that nobody seems lazy to discuss him anymore
Start of Punk Hazard was good until it became weekly Mocca show
Start of Dressrosa was good, it felt really mysterious vibe with the whole "everybody in the country before 9 PM" almost like a horror story, then Fujitora made debut etc.. until the draging of birdcage and dragging of Doffy fight
Start of WCI was good, evil Pudding was interesting story, we got Pedro and Brook duo, Bege etc until post Tea Party and Wedding Cake Wedding Cake
Yeah there is definitely a pattern post timeskip