I mean big box office is mass appeal. Some of the posts in here 😹. If a movie makes tons of money, it has mass appeal period (aka “appeal to more than just hardcore fans and children under 10”). And they ARE making a movie with mass appeal. This is THAT movie.
This is not Dungeons & Dragons, for example. Doesn’t matter how much critics shill the movie. It’s still going to tank. That movie is more similar to Detective Pikachu/Sonic movies. An adaption of an IP. Something cute for the fans.
The Mario Movie from the get-go is far wider reaching. As long as it’s not absolutely awful (and it doesn’t look like it is), it should do very well.