The last numbered Far Cry I enjoyed was #2. It seemingly had an almost immersive-sim level of interactivity with the environment, at least for the time. It's quite possible that I was enthralled with the engine more than the actual game though.
Going forward, Blood Dragon and Primal both engaged me with their settings. Blood Dragon was perfect in every way, especially in the ways in which it was not like a 'normal' FC game (relatively short, no connection to present-day reality, kooky weapons and visual style), whereas Primal spoke to me on an almost, shall we way, 'primal' level given my life-long obsession with prehistoric life and related documentaries, plus the fact that they got linguists to make a proper-sounding fake language (as voiced by main character Adam Jensen!!!).
After that, sadly, nothing interesting has happened. I gave Far Cry 5 a chance when it was on a super sale recently, even going so far as to install a bunch of mods, but in the end I regretted ever setting foot in that world. New Dawn seems too similar to be anything worth trying.
I never had any hope that Far Cry 6 might scratch a similar itch to Blood Dragon and Primal, but I did reserve some amount of positivity that maybe the silly spin-off game might be good once again. However, with the DLC being focused on the 'crazy villains', that does not seem likely.
Does anyone have any suggestions for FPS games that are set in narratively-interesting, unique worlds (open-world not required)?