I’ve never played Far Cry, but you’ve described the kill-spree momentum I used to enjoy in games - specifically the outcome of a previous action being the entry point for another, with no slowdown - making it feel fluid and dynamic.
The closest thing that matches that sheer freedom of gameplay, was the swing physics of Spiderman 2 on the PS2. No other spiderman game has come close to that, and I’ve played then all.