I was almost with you, til you threw in Primal. The game where they decided to take the literal worst bits of gameplay and throw them front and center so you could enjoy awful melee and horrible AI companions full stop.
Far Cry mostly benefits from not being popped out yearly (until Primal, go figure). It always feels like they've had a bit more time to refine it, and possibly a bit more freedom to be goofy or ever so slightly mature from being the flagship like Ass Creed.
Of the other 3 of the "Ubisoft Open World Games", Watch_Dogs 1 suffers from being a Driver sequel that somehow got reformatted and hyped into a new franchise. Watch Dogs 2 actually gets a bit of its own identity and feels a bit more like the style Far Cry was developed with, willing to indulge in camp, wearing influences from silly movies like Hackers in much the same way Far Cry often seems to be a riff on B-movie action films.
Ghost Recon I'm guessing is a dull lifeless slab (though the gameplay itself is well done enough, not enough to hold up 80 hours of it or however much it is, granted) because Tom Clancy must be serious business.
AC : Origins would be a much better game if it was maybe half the size. There's bits of inspiration in it, but not enough to fill out the whole thing. Again, the non-yearly benefits them, but it gets undercut by the need to have the flagship be ever bigger, despite not having the ideas to fill it.