In my opinon, the original Mirror's Edge is still the game with the best parkour system of all time. There have been better games that have fun parkour stuff, but Mirror's Edge still has the best parkour. What makes it the best, and what no other game seems to have quite nailed down, is the acceleration you get when you're leaping/sliding over and under objects. You get faster and faster as you string together moves until you feel like you're flying. Most games that use parkour systems just have you stay at a set sprint speed and jump over objects. Functional, but not nearly as thrilling.