Ive seen alot of reviews of people saying they went to the cinema and the movie was boring and not for kids because it was a documentary...
They thought it was a cutey lego movie about kids and like the lego movie. or the lego batman.
Perhaps look at what the movies about before spending money on your 5-10 year olds to watch a movie made about adults for adults.
Other than that..
I loved the movie as a rap lover. especially thats its from my childhood legos..Damn they really had no budget