I'm a grown up, I have no kids. I just liked the Lego movie so much, I had to get this as soon as it was out of theaters (because none of my friends would watch it with me in a theater). This movie is hilarious, tons of Batman references and frankly a lot of mature humor (I don't mean explicit, just that it would probably fly over a kid's head). Will Arnnett is really great in this, great execution and perfect comedic timing. We got to see a little bit of Superman, which I hope we will see again in the future.
Definitely worth a watch for both adult and children, it was a great follow up to the Lego Movie even though it's not really a sequel and more of a spin-off.