This excerpt from Wikipedia on the Lego Ninjago Movie's profits: Various tracking services had the film projected to gross anywhere from $27–44 million from 4,047 theaters in its opening weekend.However, after making $5.8 million on its first day, weekend projections were lowered to $21 million. It ended up debuting to $21.2 million, finishing third at the box office and ranking as the lowest opening of the Lego franchise by over 50%.
I liked it, many people did, but many people did not. It was a good movie for the lego franchise, and I think the reason that people didn't like it is that, when they went to watch it, they were expecting something that really lined up with the tv series of Ninjago. It's not a part of the episodes, its a spin off, and maybe people didn't understand that. If they make a second one, they need to make it more clear that this is a spin off. Maybe introduce new characters who aren't found in the episodes or a theme that isn't in the episodes. Anyways, after saying that, I hope that there is a second one.