Even Call of Duty has a parry now and it's kind of brilliant - but do we need it in every game?

I, for my sins, enjoy parry mechanics. I use 'parry slop' lovingly as a shorthand to refer to action games I want to play which feature parrying as a predominant mechanic. I am also a Call of Duty campaign enjoyer, and those games rarely feature any melee combat, let alone something as advanced as parrying. So, to say I was genuinely surprised to see Modern Warfare 4 bring the two together would be an understatement.