I can’t tell you how kids will feel about this movie, though based on what my brother has told me about my nephew I suspect they’d be pretty excited. Personally, I thought it was hilarious. Perhaps more impressive, Lego Batman somehow managed to reprise the meta-level commentary and self-awareness of The LEGO Movie without simply copying the same shtick. This is a Batman movie that makes Batman (and Batman movies) a part of the punchline as well as the setup, and revels in that the entire way through without feeling mean-spirited about it at any point. It helps that they’re using basically the same Batman character from The Lego Movie, appropriately heroic and usually annoying as hell at the same time. It gives him plenty of opportunities for character growth. It’s a good movie.
This movie also does something that I admire in any story that takes place in a series, or as part of an ongoing story-world: I don’t think there’s any need for the viewer to be familiar with the rest of the Batman mythos in order to enjoy this. For one thing, the movie makes most of its other setting references explicit. For another, all of the issues at hand are so well established that there’s no need for outside sources. You might benefit from knowing more about other Batman stories, but they’re not strictly necessary.
And as I implied at the top, this movie is constructed like most good children’s entertainment; the comedy and drama are constructed in variably accessible layers, with some things clearly geared towards the adult audience which will almost certainly be forced to watch the movie over and over again. It’s a good quality to have in a kids’ movie, especially since the people who actually have the money (and perhaps thus the true consumer) are the adults paying for the children’s tickets.
Overall, I don’t think I’d line this up with the best Pixar movies. I think Pixar somehow manages (managed?) to have excellent comedy alongside really good emotional content and drama, and despite feeling *good* in all those categories, this doesn’t match the emotional poignancy of a really outstanding Pixar film. But while it didn’t hit those emotional depths for me, I’d give Lego Batman solid marks. It’s fun, funny, genre savvy, and eminently self-aware. Definitely worth watching.