Where do I begin? To start off, I enjoyed the arc. No, I do not think it's one of the best arcs, though it had massive potential.
Gonna start with the arc's best quality, its setting. I find myself always getting a smile whenever the homies are showcased. The island's food aesthetic is refreshing, and the denizens that make it up are very colorful and extravagant. The arc is a feast for the eyes. Speaking of denizens, I believe the Charlotte family to be the best antagonist group since Baroque Works. Not all of them got panel time or development, but sheer number and uniqueness to them makes for fun characters to see, and in some cases, their history can be implied through subtle interactions or even design. A true mark exemplifying Oda's hand at World Building.
Charlotte family presented how ferocious an Emperor crew was. Strawhats have never felt so handily outmatched during an arc, and they needed cleverness and utility to escape the fortresses that was Totland.
Charlotte Linlin is next to the WG as the perfect symbol of authoritarianism. She's never known what's like to be denied anything. She's an overgrown child with a lot of power at her disposal. That adds to her menace, and it led to the first half of WCI to have a sense of dread and danger to it. It's one of the reasons the Tea Party segment is considered the best stretch of the arc, and I support that claim.
Addressing the "mixed" aspects of the arc, Sanji's could've been better handled. It started strong with how Sanji contrasted with his family, but the pay off was not worth the emotional beatdown he took early on. The Wedding Cake was meant as his redeeming action after hitting rock bottom, but that could've been better executed for it led to more consequences, and the lead up was too long. In fact, the entire back half could've used a trimming, as some of the resolutions, like the Big Mom chase, just weren't worth the 30 chapters of slog. Pudding's character was uneven for most of those chapters after Oda masterfully subverted her character. Still managed to give her arc a nice closure (One I hope gets followed up on). Luffy vs Katakuri. What hasn't been said about that fight? I thought it was great to finally see Luffy in a battle that forced to him to push beyond his limits. Oda didn't skim out characterizing Kata either, serving as Luffy metaphorical mirror, and ultimately kindred spirit. It too needed a trimming, as one must stretch how far Luffy's endurance can take him. Not just that, but the Flampe incident was clumsily executed, and makes itself too clear as a plot convenience for Luffy's ticket to victory. Speaking of plot conveniences, poor Brulee should rename herself to that.
All and all, I think it's on the upper end of One Piece arcs, but some things did feel unsatisfying after their build ups, and the last 3rd dragged on too much. I'd still recommend it just for Totland and the Charlottes, for they are so much fun.