Very very average game to be fair. You need to remember to save it often as well or you can get a truly awful autosave where your in a really bad position and have to start over again. The game was advertised as something where you could make choices of how you actively engaged enemies, having stealthy kills allow you to use the better ammunition in sections where you really needed the extra firepower, whilst people like me who run in guns blazing where offered the garbage ammo but in good enough quanitities to allow for that style of gameplay. Never worked that way though, instead you'd end up pretty much running out of ammo regardless of your playstyle at certain sections of the game, making it stupidly hard.
The game whilst it remained in the tunnels was decent, but as soon as it got to the outside city parts it was dire and lost a lot of its graphical appeal to be fair. I paid full price for it on preordered release as well...
Win some you lose some I guess lol