Call of Duty: Modern Warfare 3
Call of Duty: Black Ops
I like neither, but I wanted to express the fact the Modern Warfare series still uses the same recycled game mechanics, which is inappropriately slow paced (i.e. very short sprinting times and very long ADS times) and not immune to hacks.
I think that Call of Duty Black Ops is better because it had a good campaign and good multiplayer. It is where gun game, one in the chamber, and sticks and stones all started. But most of all its the zombies. With PHD on every map, I could make it to round 20 easily. MW3 was just MW2.5. It was just a knockoff of MW2. Same guns, same story, same survival, and same perks. Black ops is better in my opinion.