This was my first experience with the Far Cry series, and I've played about 12 hours into it, taking my time going through one leg of the story. My experience is with a standard PS4.
The gameplay is standard FPS fare. Nothing particularly special, new, or outstanding. I needed to reduce look sensitivity off the bat to keep my view from jumping too far on a light thumbstick press, but once that was done, controls were pretty tight and standard. The game world is nice and open, with multiple "regions" that you can progress through, 75% of which are immediately available following the short intro island. There is a progression of perks that you can attain to customize your playstyle a bit, but ultimately, most of the ones that you're going to want are all attainable. There are a decent number of weapon upgrades, but I feel they're somewhat limited. The mercenary AI is expectably average, as are enemy combatants, sometimes just standing there waiting for their point-blank headshots. However, the formula is one that works, and works pretty well. I've encountered several functional bugs that are somewhat frustrating, including a story mission involving an airplane, where upon being shot down (dying) and resuming the mission, it consistently respawns you in the air with your aircraft completely powered down, causing it to instantly fall to the ground. This results in a death loop unless you quickly hop out and open your parachute. I expect this will ultimately be patched, but I refuse to believe that nobody noticed this in testing. Quests and collectibles are everywhere. Not Assassin's Creed Origins level, but enough that I decided to start overlooking anything that doesn't strike me as really interesting, for fear of getting burned out before I can finish the game. If you're a completionist and love having tons of stuff to do, this game will satisfy your itch.
The foothills of Montana are amazingly detailed, and environmental effects are superb. Character models are a bit stiff in their stature and movement; better that last-gen, but I've come to expect more. Variety in character models is also sorely lacking, and often multiple copies of the exact same model can be found standing right next to each other. Other games get around this by giving you gas-mask equipped, uniformed soldiers to fight, but when your game calls for plainclothes American cultists, it's very noticeable, and I wish a little more work was done to avoid this. Also, while flying in an aircraft and hunting for ground-level mission targets such as vehicles, they often don't visibly spawn until you're practically on top of them, and they vanish again when you come around for a second pass, making it seem like an intentional draw distance limit while piloting. Ground structures and scenery do not have this problem at all, so I expect those were given priority and the "moving model" distance limit was imposed due to graphical limitations, and it's possible that the Pro model PS4 might handle this better.
Sound is pretty good, and they've done a decent job with the surround. Nothing really noticeable, but then, you're not really supposed to "notice" sound effects. They're just supposed to be natural. The music isn't anything you're going to want to listen to outside of the game, but it fits. There are a few bugs where the game applies an effect, such as echo to speech (meant to sound as if it's coming over loudspeakers), and then has a problem turning it off again, so that radio chatter and voices of people standing right in front of you ~also~ sound like they're coming over a loudspeaker, but it's not often enough to be a serious problem.
The story is good, but requires mild suspension of disbelief, as it overlooks the most sensible solution (escape the region and contact the national guard) in favor of (help out the locals and build a civilian resistance). But video games are all about suspending disbelief, so I won't hold that against it. A superb job was done with the voice acting, and I'm looking forward to seeing the rest of the story unfold. There are some areas of enforced progression that seem to be triggered by your progress level in an area, in the form of "elite" soldiers showing up to capture you, which they manage by using drugged weapons that you can't really avoid, which is sort of a lazy mechanic, but a tolerable one.
Overall, I think this is a good game, and I'd definitely recommend it if you have a love for the FPS genre and enjoy long single-player campaigns.