If you really love ninja gaiden this will let you play it on the vita. I wouldn't consider myself a big fan of the series but I did like the slashing and blood spray of the original. The blood spray from this is no where near as satisfying as in the console versions, most likely due to the vita's lesser graphical muscle. The vita controls don't seem to be as precise as the console controls so it can make it difficult often to get any combos going. Also I felt like I was fighting the controls and the camera 50% of the time to traverse the game world. Worth a rent but glad I didn't buy it. If you really like the series stick to the console versions.
I've played this on four systems now and I like this the best because it 95% accurate and on the go enough said. People be to harsh on the most perfect game at the peak of videogame-doms power. Resident evil four and various Mario iterations can't hold a candle to the depth of gameplay.
This game is hard, too hard for people just in it for the story or the cutscenes. Even the NORMAL setting requires a bit of obsessive attentiveness in order to keep going. And then theres a part of the game that takes it too far by applying a 'challenging' mini boss.
Otherwise, this is a pretty engrossing game with awesome graphics music and action. Just don't expect to finish it the same year you got it.