Looks really fun. It's a piece of software that really goes with the system and shows off its appeal. Makes great use of HD rumble, the joy cam, its sensor etc. It's the one game they showed that I can actually see myself busting out at some kind of gathering.
Problem is that as fun as the game looks, it's kind of hard to market. It's the kind of game that I think a lot of people would buy if they tried, but not a lot are going to try it at the price. Nintendo should have just taken the hit and bundled it. Not necessarily because the game isn't worth it, but because they want Switch owners to have this and show it off.
But then again, if it was bundled people would be complaining that Nintendo should have taken it out to drop the price xD