User blog comment:Bovell/Opinion: We don't want Black Ops 2/@comment-867628-20120220211334/@comment-25496444-20120220220413

It's still an indirect sequel, as its plot is affected by the previous game's plot, but can also work as a stand-alone. Technically, Modern Warfare 2 is a stand-alone (new main antagonist, new characters with only a few references and plot based on the events of the previous game).