Unity received many negative reviews because the game had been too ambitious graphically and as a result had many bugs in the first year after its release.
Over time, these bugs have been eliminated.
As you say, the game-play is a strong point.
Another strong point of Unity is that it is still graphically the most beautiful Assassin's Creed game.
Comments on this video:
#1 Its sad that we never gonna see the game like Unity again.
#2 Is it just my bias or AC Unity' graphic truly ahead of time? Paris looks insanely next-gen compared to every one of its successor cities
#3 People often speak about how great Unity's parkour system is, as they should, but one thing I really love about that game is the combat system.
Having to actually look at enemy attacks and time your parries is quite satisfying. And the animation flow between parrying, dodging, rolling and attacking looks very impressive.
#4 The scale and detail of Paris is still unmatched. Definitely the finest open world ever created by Ubisoft.
#5 No Assassin's Creed can beat Unity graphics and parkour.