It's not the second coming of Deus Ex, but it's a really good game.
The combat mechanics are not the best I have seen but they are hardly bad. In fact I had read a lot about this game before trying it myself and one guy had written that the best way to play this game is choose pistols and upgrade them, to avoid the awkward shooting, but I soon learned that assault rifle is a lot more effective and not awkward at all, and I'm using pistols only for stealthy take downs.
As far as graphics - yes they look somewhat dated, but the game looks good anyway, certainly enough eyecandy there.
But it's the espionage part, the rpg elements and the dialogues/story that make this game - no way this is a 6/10 game, no way in hell. And the replay value? Should add +1 to the score for at least that. I love this game so far and judging from how the story and characters are developing I will love it even moar. Criminally underrated gayme.