Call of Duty franchise has sold over 188m units as of July 2014

[Carl]

Samus Aran said:

Sales don't equal quality.

Of course.

Though when Call of Duty sells over 20 Million units per version every Year, then that is one huge target audience that keeps jumping back into the franchise and people are quite clearly happy with the games.

A bad game wont sell over 20 Million units every Year.