They are totally different games. I don't need to explain COD or BO. Hitman is about strategy & stealth. While you can run & gun it, you'll find it really boring and poorly designed if you do. And Hitman does have a unique multiplayer element, where players across the globe create custom "contracts" and you compete with your set of skills and items to complete them with the best "score". HTH
Note: Hitman Absolution probably has the most intenses hardware, or at the best programmed, to date, scaling with a dozen CPU cores along with GPUs. The only game I can think of where a 6 core 12 thread Sandy Bridge E i7 make a sizable difference in FPS verse the 4 core 8 thread i7 ivy bridge.