Unity is flawed, but somewhat of an underrated gem. It's such a shame that it released in the state it did and got the reception it did because that's pretty much what caused Ubisoft to pivot into the style of the Origins and onwards style games.
Imagine what could have been if they built on what they had in Unity? The free run up/down system had so much potential and - while janky - the Unity parkour can produce some of the most pleasing, slick and stylish sequences. Just look at the stuff people are pulling off!
Also, revolutionary Paris is the best realised city they've ever made for an Assassin's Creed game.
Already pre-ordered the Ultimate edition. Goes against my usual principles but I don't care in this instance. I hope the game is a massive, GotY contending success.