So, out of all the big mainline sports games that have come to the Switch, only NBA is free of problems. FIFA lacks half of the modes and is more expensive, and WWE apparently runs awfully.
Which is weird, because both NBA and WWE are 2K games. I remember they put out a pretty hefty patch for NBA 2K18 some time between the digital and physical releases. I waited for the physical release before buying, and by then it was running fine. I expect they will do the same for the WWE game. Although, I do agree, they shouldn't have rushed the release if it's in as sorry a state as OP describes. A shame. I was looking forward to this. Hopefully 2K gets a patch out ASAP.