This is a great game that was definitely worth the 7 year wait. The game is down right beautiful and it is paced very well. Seeing the new realistic textures for the fish and bugs is amazing and all the new fish and bugs (such as the Paper Kite Butterfly and the Barreleye) are super great additions, although I am disappointed deep-sea diving did not return (as of writing this, at least).
I've seen a lot of people complaining about the fact that it is one island per switch, but they do realize a direct about the game came out a whole month before the game did, specifically stating that fact, they should put more research in before they buy a game. In past games, there was no way to play with people that live in the same town, so I don't understand why people are complaining about this new feature.
TL;DR Great game, people complain for no reason