Great game, but not for everyone.
This game, as you probably know, is a stealth action game, which is one of the two bad things about it. Stealth games are difficult, unless you spend lots of time playing them, or you just have a knack for sneaking up behind people and killing them. The other problem is there is no quicksave feature, so every time you die you have to start from the halfway checkpoint, or the beggining if you haven got to the checkpoint.
Anyway other than those two things this game is pretty much flawless. The AI is great (as I would hope it would be in a stealth game), controls: Perfect, graphics are some of the best I've seen in a PS2 game, and well everything is just about perfect.
So, if you love Metal Gear Solid, than this game is just right for you, but if you're not too good with stealth, than you migh have an issue.