I have to say that I disagree with that. Far Cry is an excellent shooter, but I don't think that its shooting mechanics are necessarily synonymous with the series. Rather, I think its appeal lies in its ability to subvert player expectations; in many ways, while you play the game, the game plays you. Look at Far Cry 3 where the mission is to rescue your friends, but your friends are all horrible people - Liza wants Jason to grow up, but only on her terms and denies him any sense of identity unless he follows her script. In the end, you wind up killing hundreds (if not thousands) of people for the sake of a cause that is increaingly difficult to justify. Likewise Far Cry 4, where you are repeatedly misled in the fight with Pagan Min - where he is portrayed as a bloodthirsty, ruthless and dangerously unstable tyrant by the Golden Path, an alternative view shows a man who let his own personal tragedy get the better of him and that the war in Kyrat is an extension of his fighting his own grief, and the game counts on you getting caught up in side-quests and missing the finer points that duggest something is amiss.
So I will be curious to see how Far Cry Primal continues this trend.