Whether this is intentional or not, Ninja Gaiden Dragon Sword is bridging the classic NES Ninja Gaiden games with the newer Xbox/PS3 game. Not necessarily in terms of gameplay, as, except for the stylus control, this looks to play a lot like the Xbox game, but rather, in presentation.
The NES Ninja Gaidengot noticed in 1989 in part because of its brilliant anime-style cutscenes. Dragon Sword relies on the same kind of device to tell its story, using startlingly well-drawn comic panels to tell the epic story of whatever the excuse is this time for Ryu Hayabusa to slash at people and monsters with a big sword. It was probably a space-saving decision to use still images to replace full-motion video, and, judging by the results, it was a good one.