I totally disagree, I loved it. Not sure what "incoherent" is supposed to mean, but I suspect it's maybe that it's hard to be quite sure what to expect from it, and what it tries to be? It's not straightforward comedy, and it's not really drama either. It's just a story of a group of people who happen to spend the same week at luxury resort in Hawaii, and their foibles, troubles and relations. Which brings up plenty of amusing situations, but above all it's character driven and focused on human relations. All told with a level of perception and nuance you'd expect from a really good novel rather than a TV series. And that's it I guess, for characterisation. The story it tells and the way it tells it is instantly recognisable if you think of it as a novel. It's just unusual for a TV series.
I'd recommend it to anyone. Just take it as it is.