I'm struggling a bit with this one because the film was pretty much bang on average, not too many good bits and not too many bad bits. Robin's constant insistence that Batman call the JLA is rebuked in a very Batman fashion for very Batman reasons, Superman is so goody-goody that he borders on annoying and Cyborg is forgettable. One day I'm going to do an entry on why Cyborg's promotion to Leaguer was awkward tokenism, but for now enjoy him failing to be at all interesting. There's also a great callback where Robin thinks Batman's kryptonite hording habit is a tad paranoid, but Wonder Woman thinks it's a great idea. Also, no one seems to like Green Lantern very much, which I'm not sure isn't a reference to the terrible live action film or just a continuation of the joke from The Lego Movie.
If you need something to get the kids into superheroes, or just want something on in the background while you paint, give this a go. It's not great, but there are a few laughs to be had and it's certainly better than most live action DC releases of the past few years. There are a couple of sequels and I may get to them at some point, but the media backlog still looms pretty big, maybe if they show up on Netflix.