https://www.polygon.com/2018/12/11/18136617/super-smash-bros-ultimate-online-issues-multiplayer

Super Smash Bros. Ultimate isn’t a game that lives or dies by its online features — but if it were, it would be dead in the water, according to many players. Days after launch, players say their premium Nintendo Switch Online subscriptions are totally wasted on the new Smash Bros., because playing online simply does not work.

The problems are myriad — so let’s start with lag. There are few things as frustrating as a laggy fighting game, and players report serious issues with connection and input lag. If just one player suffers from a poor wireless connection, it can bring the entire match down. We’ve run into that here at Polygon, and it’s one of the Smash community’s most commonly cited issues.