It strikes me as a TMNT or Streets of Rage sort of mindless beat'em-up, but with a Batman license and some sort of blah-blah story. It really does look like it plays quite a bit on the slow side, doesn't it? Still, it COULD be fun once you actually play it, but I'll bet that it will be a fairly short game regardless. Maybe that's why they made it play in slow-motion like they did.....to sort of drag out the gameplay.
I'll definitely give it a look when it comes out. I'm sure it will at least be better than Tokyo Beatdown, which isn't really saying much. We don't get many games like this on the DS that are any good, so I'll give it a more-than-fair chance because I used to like these types of games in the 16-bit days. If nothing else, the Spider Man game is coming soon too, so we have two chances to score a decent side-scrolling beat'em-up that doesn't contain any flower-and-bunny cuteness.