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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If you're fully leveled you can get around really fast. I could travel much faster in dying light than in AC. AC's "parkour" always frustrated me, I would always randomly jump off walls to my death in the earlier games, and Unity's physics are incredibly broken along with the rest of the game.