I have it. If you're a fan of the show and classic side-scroller games then you'll love it. I highly recommend playing with a friend. I posted this in the general discussion thread awhile back:
There are four episodes, each episode has a teaser followed by the show's opening credits and original animation, 1-2 minutes long, before the start of the stage. Batman teams up with Robin in Gotham, Blue Beetle on Science Island, Hawkman in London , and Guy Gardner on different alien planets.
The dialogue in this game is great, not only in the little cut scenes but also throughout each level. Batman and Robin are constantly exchanging witty remarks back and forth, Batman teaches Blue Beetle lessons on being a hero, Hawkman deals with aging while Batman gushes about being inspired by him as a child, and Guy Gardner deals with his anger issues. It's a little corny but in a good way, and a lot of it is legitimately funny. It's very well written and seems like it's straight out of the show. All the characters have their TV voice actors providing the dialogue.
The game play is pretty simple beat em' up style. Batman has a variety of gadgets that you unlock as you go, the other characters have weapons, gadgets, or powers at the start. The thugs and minions are somewhat diverse. You shake the Wii mote for heavy attacks, for charge up attacks, and assists.
I read reviews that said the game was short but it really wasn't. There are only four stages but they're broken up into levels that are all relatively long. I would have appreciated another two episodes with one of them involving all the heroes in the same stage. Overall it's a really fun game that is definitely worth a buy if you have a Wii and love the show. Overall I'd give it a B+.