I'm having some fun. But it's so generic. We've been playing the same game over and over. And sometimes it feels like other ubisoft games. Open world, enemy outposts, base building, gathering resourcers, crafting. Division, assassin's creed, watch dogs, ghost recon, all have similar mechanics.
I had the wrong assumption that this would be a looter shooter because of the colored tier weapons. But it's not. You just need the right tier of weapon to kill the same tier enemy more easily. I didn't like it honestly. And the lack of weapon customization is a letdown.
The twins are completely forgetable. The enemies overall are very uninteresting.
I wish they'd went further into the post apocalyptic theme.
I definitely wouldn't recommend playing it straight after 5, especially if you've put the effort to spend more time with FC5 to unlock more stuff. It really feels a like an expansion and on top of that it's inferior in many ways (story, antagonists, aesthetic, unnecessary rpg bits, spongy enemies etc.).