Released on November 9, 2010, CoD: Black Ops showed less demand than Call Of Duty: Modern Warfare 2, which is easy to believe due to the backing out of Infinity Ward, whom released MW2.
Treyarch had a lot of work to do since their release of Call Of Duty: World At War didn't go so smoothly either. Aside from the decreased graphics from MW2, overall, Black Ops is very well balanced.