You should buy this game for its awesome soundtrack at least. This is an all-time classic stealth game. Pure greatness.
Furthermore, apart from Agent 47 character, the soundtrack of the game is just "epic". It really takes you into the action. Of course the credit goes to Prague Symphony Orchestra for performing such a great music. Besides the music, sound acting is also pretty decent in the game. As Agent 47 travels all around the world, you come across to different types of characters talking their native languages. About the graphics... well... they will not satisfy you like recent titles but hey it's a 2003 game so nobody should expect better than that.
All in all, if you're a stealth action game fan, you should definitely add Hitman 2: Silent Assassin to your collection. It's a great game and its soundtrack is awesome.