It's probably second in that regard to Wano, but it was definitely a major disappointment. Along with being a poor man's Alabasta, it had such damaging factors as Oda explaining Sabo's lack of prior involvement away with convenient amnesia that suddenly went away when Sabo's memories were triggered by Ace's death (which is far from how amnesia works), too much time dedicated to one-note minor characters and the reveal of Gear 4th being a cheap way to overcome Doflamingo.