An impressive port, and a decent stealth game.
The game's story is OK at best, Rikimaru and Ayame being the good ninjas serving a goody-good emperor whose empire is apparently about to be attacked when Rikimaru finds a stockpile of weapons in a room in the wrong part of the empire on one of his justice-serving outings.
The gameplay is good, stealth mechanics work and it is enjoyable. Taking enemies down is satisfying and you can twirl the analog nub around to get different killing animations. The only complaint I have is about sword combat, where it really shows that this is a game ported from the Wii. You push the analog nub in the direction the on-screen arrow tells you to, and it's very easy to do this. Almost too easy in fact, so sometimes you get killed because you weren't expecting it to be so easy.
Aside from that, the game is challenging. You can use your Mind's Eye as much as you want to see where the enemies are looking, but it's still a very difficult game. You can use your Ninjitsu to escape to the start of the level once if you get detected, but after that if you get seen the enemy throws his sword at you and whack, you're dead.
The music is very good and the graphics are excellent. The gameplay is enjoyable, and the voice acting, except for the tutorial instructor's (which is annoying as hell) is very good too. While the game doesn't really be all it can be in my opinion, it's still worth playing for any stealth game fan.