Good shooting and a lot of action!
The story is about you working as bodyguard to a big boss in the japanese mafia, and then being engaged to her daughter. This is when the fun starts because a traitor in the organization, in an unexpected strike, kidnaps your fiance and injures deadly to your future father in law.
At this point you'll begin a chase to save your girl, form a common front with the elder japanese bosses, learn some very cool moves and shoot as many foes as possible.
The game sports some very nice environments and cool and detailed graphics, as well as some cool explosions. Sadly enough this is not consistent as you may find some glitches that can downgrade your experience. Also, the lack of certain expected effects in certain environments are disapointing, like in some very dark areas where you have to play with minimal light sources, the least you can expect is some flashing lights from the shooting, like in Call of Duty 3, but this never happens.
The sound is good enough and adds a lot to some gunfights, but in general there is not much to say about dialogues (this is a very difficult point because my native language is Spanish and several Ubisoft games are dubbed in Castillian Spanish, which sounds pretty odd to most of the americans like myself). In any case, the voice over acting sounds flat and uninspired most of the time.
The gameplay is really good, but it requires you to adapt a FPS model where your ability to turn fast may be compromised with your abilitie to re-locate yourself. Let me explain further. You'll turn when you reach almost the edge of the screen, so you can point very nice when you're not moving, but if you need to turn abruptly, then you 'll need to find very quick how's your new position in relation to the enemies, because you'll need to do a very large movement which difficults to keep precise aiming.
There are several other movements mapped to the motion sensing scheme, like reloading or tossing grenades, opening doors or activating some mechanisms. In general all of them work just fine.
Finally, the sword fighting, as a big differentiator from other shooters, is a mixed reactions experience. Aside from the basic movements, later in the game you'll be able to learn some other moves to increase damage and improve your chances to win, even breaking your opponent's weapon.
The fact is that, despite the fact that you can customize if you prefer to do large or short movements to control your sword, it tends to be unconsistent the response from your character. So, sometimes, when trying to perform your best and recent learned combo, you end with a motionless and unresponsive heroe which suffers a serie of continuos strike 'till dead!
Note also that, although the game have a lot of linearity it allows some exploration in order to outcome some challenges from different point of views. Unfortunately there are few elements to encourage exploration, as they are no much of "hidden" bonuses or extra content.
There is also a multiplayer option with split screen, but is very limited and doesn't have too much replay value.
Overall, is a very decent attemp to explore Wii's capabilities to FPS, and I recommend you to, at least, try it out.