For me, one of the best AC in the series. I know, I know... Hear me out.
The game has more than a decent story, great main protagonist, gorgeous graphics, and one of the best and most fluid parkour in the whole franchise. Like, for real, the game is great to control. To be fair, the game had a rocky start and it's not that well optimized to this very well. I have a 1060 graphics card, the 6GB version and I was running it on high details on 1080p and the frames were not really that stable throughout the game at all. But if you can't get past the technical difficulties, Unity is a game that shouldn't be forgotten. Nearly 6 years old and it still holds up better than most of the games from that era.