Traversing the buildings, climbing walls, and other various acrobatics in Assassin's Creed is far superior to that of Dying Light. When climbing up onto a wall or ledge in Dying Light I feel like a fat kid struggling pull himself up. I can hop a wall in a second or two flat, and I'm no special forces wannabe like the main character in that game.
With that being said, it is a fun game. You really get that feeling of being the last person on Earth, even though that's clearly not the case.
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After Unity, I'm scared about future AC's parkour systems. It felt so broken. I wish there was a first person mode, but that's pretty much why I played Mirror's Edge.