The LEGO Batman Movie is a very funny send up of the Batman character and is a capable follow-up for the character as created in The Lego Movie. Set in a Lego Gotham City, Batman spends his life in solitude, only venturing out to clean up the streets of the warped villains he encounters or to maintain his Bruce Wayne persona. Otherwise his is a lonely life in the cavernous Wayne Manor with only Alfred and pictures of his murdered parents to keep him company.
Not going to give away too much of the plot here because part of the fun is watching the scatalogical mayhem that ensues over the course of 1 hour and 45 minutes.
Part of me thinks that movies like this must be pretty easy to write. You have few boundaries and logical restrictions to hamper you. The number of pop culture references and call-backs on display recall both the 1st Lego Movie and the "Imaginationland" episodes of South Park.
The knock I mostly have with this movie is the same I had with the first Lego movie: When there are action sequences, so much motion and shit is thrown at you at once that the hyperkinetic-ness of it all can be disorienting and confusing.
The voice work is all pretty good with Will Arnett reprising the Batman role, newcomers Michael Cera as Robin, Zach Galifianakis as the Joker, Rosario Dawson as Barbara Gordon and Ralph Fiennes as Alfred (though it was a bit of a head scratcher as a character originated by Fiennes in another movie makes an appearance and is voiced by Eddie Izzard instead; they couldn't get Fiennes to do an extra 3 minutes in the studio???).
There is a great sense of history as the movie touches on just about every variation of the Batman character from Adam West to Michael Keaton to Christian Bale, as well as the Super Friends cartoons, comic books and pre-West TV incarnations.
I rate this flick very highly on an entertainment scale, though like I said before, given the amount of source material you can draw from to lampoon or pay homage to given the universe they play in, I think the "difficulty rating" bar is pretty low. Still, I laughed frequently and that's gotta count for something nowadays. 3.5 / 4.0
P.S. A little parenting tip. If you decide to bring a 2 year old to a movie and you sit in the 3rd row and they spend 15 minutes crying, they are not enjoying the experience, you are not enjoying the experience, and the people in the auditorium are not enjoying the experience. It's probably not wise to wait for ANOTHER 30 minutes of screaming/crying before taking your precious offspring out of the theater.