They both have excellent single player campaigns. They are both hard on systems too. The sad thing about these games is that their single player and multiplayer are exact opposites for settings. On a single player, if you have a nice system, turn it all on. The experience is worth every penny spent. However, the multiplayer is the exact opposite. If you want to survive, you need to turn it all down. The players with the least powerful hardware have the advantage. They can see you through all the eye candy. Which means, they can kill you through it. I played MOH, IMO it is a step backwards on single player campaigns. It is way too linear. It took me 3 1/2 hours to beat it. Way too short!! It has the same problems mentioned earlier for multi. Black OPs looks good. But, the trend appears to be set. The message appears to be 'Don't worry about having nice equipment,' it just isn't going to help.