Words can't describe how incredibly amazed I am by this game! It puts "the best selling FPS game" to shame.
Here are my PC specs:
Intel Core2Duo E8400 3Ghz Processor 6MB Cache
4Gb Memory (Corsair)
500GB SATA HDD
Windows 7 32-Bit
nVidia GTX460 GPU
Ok here is the bottomline...... the PC version is VERY STABLE. None of that Black Ops crap where the game needs to be patched a week after release before it becomes remotely playable, and a month before it is remotely stable.
Day one and the game is beautiful. Haven't played much yet but I see very little stutter at Extreme settings with VSync on, but I set it at Very High nontheless just to be sure that I don't experience any slow down (one notch lower graphic settings). One thing is that you can't tweak the graphics settings but who cares? As long as the game is playable with the most intense FPS graphics you'll ever see and considering this is the most dated FPS to boot is good enough for me.
Haven't played the multiplayer though but all I can say is that it is worth it. So far I'm at the New York City setting and none of the maps are reused, you still get to go around the environment to see the most tactical way of dealing with enemies.
Stealth is activated by pressing E. Armor by pressing Q, speed mode is by default and pressing L-Shift makes you run. There are also stealth kills by pressing V (melee button) while your opponent is behind you.
If you are second guessing if you have to buy this game, do yourself a favor - DON'T! Just the Single Player experience alone is worth your USD 60. The Multiplayer is just icing on the big fat cake.