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I feel sorry for anyone who thinks this franchise is "phenomenal". It's been the same exact game for years without any sort of new innovations. And the online is just god awful, unless you consider "fuck it and chuck it" hand grenade fests to be fun. The single player campaign is linear with barely any replay value.
And to bring up sales when discussing gameplay quality - are you kidding? CoD is so popular and has such a massive, loyal fanbase that people will shell out the $60 for the newest title despite it being the same fucking game they bought 6 months ago. Has nothing to do with the games being any good.