OK, thanks. I get it now, I think. I loved Golden Axe and the Kunio-kun games, and with those as a reference point, the difference with Batman AA gameplay is clear. I wasn't into God of War, because it seemed to rely on more butt-stabbing ranged-attack enemies after the game's midpoint. DMC I can't even talk about; I've played the demos and they didn't grab me, so I guess I like OLD brawlers but haven't moved up to this gen's representation of the genre.
I guess rather than expecting Batman AA to be a classic brawler with exploration elements, I just want to play as Batman through a gorgeous comic-book setting. The demo had all that, and all the retail version has to do is keep doing what the demo did.
I also think the main gameplay is going to be figuring out how to whack an entire room full of baddies without taking any damage. Go in, take a guy out, bail before reinforcements with guns show up, lather, rinse, repeat. I'm up for 10+ hours of that.