Maybe I'm just a crazy old coot but I still think the faces look way better in AC: Unity than any of the last three (3) AC games (I didnt play Syndicate), I know the animation is better but because they said they dont use face capture as much anymore to speed up development but the lighting is so much better to me and that makes it better overall:
Compare it to the faces of any of the men in the new trailer. This guy's eyebrows are amazing

and thats just a random dude in one mission compared to main characters in the new AC. I know there are other technical improvements in new AC vs. Unity but its still better overall to me, feels more like a real human. When I look at the new AC I just see potato heads.
If the next-gen AC thats coming (hopefully) doesn't wow me like Unity did then I'm out for a while, the graphics/animation just keeps disappointing me over and over and thats what I used to love so much about AC. Just look at the rest of the video I posted the parkour is like 900x better than current AC parkour, animation-wise, even if its less versatile ie you can't climb every wall in the old ones, but then again that was part of the game to find the right path upwards.