BLACK OPS PC.

Hello guys, i recently got BLACK OPS for PC, but im very dissapointed with it. I dont know if its my PC or if its the game. My pc specs :

CPU : AMD FX6100 Six Core 3.30ghz
RAM: 10 GB
GPU: Nvidia Geforce GTX 550 ti 1gb

So i start the game, and the game lags like *** i tried another servers, everthing, even tried the resolution (LOW) and the game still lags, its not smooth at all dont know why, and i noticed a little of Mouse Lag while aiming. I saw some videos on youtube guys with better PC than mine and they say the game is Horrible Coded and it lags so freaking bad.
My question is : Is my PC the problem? Or its the game itself?
Thanks in Advance.


(EDIT) : No one have this problem?   Its just me? At least tell me if my pc is capable of running this game perfectly. Thanks in advance.