I've already said this. They've added lots of post-processing effects to give it that CG-look. Without them, it would look flat and bland. I suggest you educate yourself a thing or two about the depth of field, motion blurs, and how it works my friend. The game's using very high-quality camera motion blur as well as per-object motion blur. So, of course, any character movement is going to show trails in still shots due to per object MB. And camera movement will show every object to leave trails in still shots due to camera MB. That's how it works in real life.
Motion blur in RL:
A very good e.g. of motion blur in action:
A very good e.g. of DoF in action:
Water, grass and the tree on left, and the building in the bg are out of focus, even Ratchet's feet are out of focus. What is in focus is the enemy you're shooting, and the particles coming out of your gun. This adds depth to a scene.