They're starting to come out with some new games. I know that they're kind of lacking at the moment, but they're starting to push some new ones. And I think the device is great even for my old DS games- but then again, my old DSi is starting to fall apart so I need to upgrade anyways.
Um, Nintendo has backwards compatibility unlike the other consoles today? Animal Crossing New Leaf and The Legend of Zelda Ocarina of Time? The upcoming Super Smash Bros game? And what's wrong with Pokémon?