the best game ever, BY FAR
This is not a game where you have to jump and kill people. This is a game where you have to think. Think why we are here. Think why we make the decisions we make. Think about the truth of our existence.
From a gameplay standpoint, it is sheer genius. The game jumps between completely different kinds of action, and the pace is simply amazing. At one moment, you will find yourself looking for hidden bombs to diffuse. At another moment, you will find yourself protecting a disabled girl from all sorts of enemy soldiers using your sniper rifle. Again, the pace at which those actions are presented is simply outstanding.
The only problem with this game is that it is not easy to get it working on a PC. You need to look for patches, and apply them in order. It took me a week before I could get it to work, but it was worth every second of it.
The bottom line is, you simply MUST play this game. If you don't, you are losing a lot.