THE GOOD: The graphics are good (for a PS2), the stealth kills are very intriguing to watch and they make the game very interesting and fun, the story is followable and easy to understand. There is also a large variety in the levels and multiple ways to complete them.
THE BAD: The scenery is hardly interactive and is very blocky. Also, although this is a Ninja-game you can play the game like Rambo.
SUMMARY: Overall this game is good for about three months but then you've completed it and 'Grand Mastered' every level so in the end this game has no replay value but is still a good one to rent, rather than actually buy. Also, the dificulty is a little too low for your average stealth game.
However, certain levels do take effort to 'Grand Master' and these can keep you occupied for quite a while.