The single-player campaign is disappointing in its brevity, lasting only around 4 and this by taking your time. It heavily relies on recycled maps from MW2, primarily in the form of the new "open missions," which essentially feel like Warzone/DMZ maps with a few objectives and bots, making them notably brief, around 10 minutes each. While there are sporadic cinematic action missions reminiscent of classic Call of Duty, they are infrequent and fail to leave a lasting impression for the most part. In comparison to other campaigns within the Call of Duty franchise, this installment stands as the weakest by a good margin. The clear deficiencies in the campaign substantiate why it was initially plan as a DLC for MW2. It strongly suggests that it was expanded into a full game solely due to Activision's need to produce a new Call of Duty title each year.