Once remembered that around 8 years ago, when I was still in University, Call of Duty series were popular around. At that time, my friends and me always find time to watch & Play in sequence, then, when everyone got their own PC, we just get together to make several multi-play zombie missions together. (By the way, Black Ops I, Modern Welfare II, World at War are really epic in story plots, I can never forget the scene when Mason and Reznov escaped from Volkota,Reznov draw attention of coming gulag troops and let mason jump to a cargo train to escape)
While at present,most of us have our budgets for a high-spec PC and even with all accessories, but few of us continue to focus attention on this series, or this category of games. I know that after a time, the game quality seems to dropped, few new feature but repeated contents. But What's on earth made people have less attention to Call of Duty series?