I don't know why this game got 6/10. I find it to be quite enjoyable. Sure there are some bugs, and framerate issues. The game is also not always as fluid as it could be. But otherwise Unity is a quite enjoyable experience. Frankly I was tired of Assassin's Creed franchise. Never really enjoyed the gameplay and the confusing story. In Unity a lot of things got fixed, resulting in a much more balanced gameplay. The story is simpler and more straightforward than before, and the world is gorgeous. Not bad at all.
At times the gameplay reminds me of splinter cell, for some reason.