Definitely takes on a different tone compared to a lot of the other DC animated movies - Batman and Gotham itself are a both somewhat sleeker and lack the gritty edginess in other media. The other main characters (eg Nightwing, Flash, Red Robin, Green Arrow) all seem to be a bit different from their comic book counterparts too, or are a mashup of a few personalities and versions of that character.
It works in this movie though, as the group prove to be a team that work well together as heroes should, despite their differences. Even with limited screentime, we get a decent amount of insight about these versions of characters whether you know them from the comic books or not. The ongoing banter between Nightwing and Flash are particularly amusing.
The villain's plans are weak and won't stand up to close examination, but you don't watch a movie like this for groundbreaking ideas and serious explanations.
I'm still more used to certain actors for some roles, but the overall voice acting was fine. The pace is fast and and doesn't get bogged down. The incidental humour is suitable for all ages, in other words not just silly kid laughs.
Overall a fun watch if you don't take yourself or the movie too seriously.