Pretty badly optimized for PC by the feel of things. My rig should be able to handle it easy, but it drops fps like a motherf**ker.
I got it running smoothly with decent visuals with a fair bit of jigging the default settings. Went medium, with ultra textures, mxaa 2 and ultra shadows and high detail I think. Can run ultra except when I get in a car, then it crashes faster than I do. Most probably a driver bug, although there is a slight chance of my, uh, install being crappy. Not much chance though, installs like that have never f**ked with graphics in my experience.
I got a i7 960, Radeon R9 280X and 8gb 2000 ram for reference. As far as I know WD was developed with an Nvidia partnership, so they may run better.