Eh I like Far Cry for what it is, an enjoyable silly time, I don't really analyze media too much if I can, especially when I know it wont stand up to deep analysis. Far Cry 5 had that great "tutorial island" (completely cribbed from BotW no doubt) I really liked, great intro to the world. I liked throwing shovels at peoples in stealth, great fun. I like a lot of things about it, I just ignore the shit parts or mitigate them somehow.
The way they altered how the missions work in 5 made for some really funny stuff too, you could abandon and return to things more easily than in previous titles, so you could get into the boss battle with one of the main baddies (a plane battle) and if you just bailed on the battle by jumping out of your plane you could go back to open world stuff and he'd just be up there flying around forever shouting abuse at you. Then I went to a new story mission part in a church where whoever was left of the big bads would be there (If you'd beaten one of them they weren't there) and even though he was literally circling the church in the plane and calling me a fucker I walked in and he was there for the cutscene. I found this extremely funny.
I find the changes they make in Far Cry games from 3 to 4 to 5 to be enough to keep me interested, they also improved the pathfinding quite a bit in Far Cry 5 since you could let the AI drive you to any waypoint you set as long as its pathable, which was excellent for me playing singleplayer.
I can understand the frustration with AC games being samey recently, I haven't enjoyed them since Unity (Skipped Syndicate for technical reasons, I might've liked that one I suppose, so really from Origins onwards I dislike) because they didn't change anything but FC 3 to 4 to 5 did actually add things. Not new things to games, but new for FC. Like the little gyro and rope climbing/swinging in 4, and flying + companions in 5, I can't put my finger on what keeps me coming back but I don't know if I want to, its just been a really fun game for me.