There was finally Vegapunk.. nothing great and nothing bad.
Lucci awakening was pretty cool but having him fight with G5 is weird.
The df revealing was bad, also it ruins something important that has been there as a question since the beginning of series.
Cross guild is pretty cool but I don't consider it a part of the arc, it is an interlude just that BB journey in Amazon lily and his fight with Law, both pretty bad: he run from opd Ray kidnapping Coby who nobody cares about, the fight with Law so shortly after BB was seen in Amazon lily sounds weird, it is probably needed in order to have BB have the road poneglyphs Law has .
The island as a concept is acceptable for sure, the clothes are good, fit woth the futuristic background and if there is something left I simply didn't notice (giant robot of the ancient century was pretty meh).
What would totally up this arc would be Kizaru coming and switching sides for Vegapunk and his nephew sake. It would instantly be above Wano and its ton of chapter (well it already is but that is just for Wano demerits).