Reposting from the Watching thread:
Saw it today; it was a lot of fun. Not on the same level as The Lego Movie, but I enjoyed it. It's got a decent joke rate, and the cast is great.
I'm glad I wasn't spoiled for the back half of the movie. I didn't see the trailers past the first one, so I don't know how much of it was given away.
There's unexpectedly a bunch of jokes about Orca, whose initial story arc was one of the first Batman comics I ever read.
It's kind of a shame that other than Joker, the rest of the DC villains don't get much to do. I'd have liked some more of Catwoman, Riddler, etc.