Disappointed that the PC version lacks the fantastic selective motion blur used in the 360 version.

Also, the water looks inferior (at least the way it draws objects below the surface when viewing them from above). I can't imagine why they would remove the motion blur (which was nearly as impressive as the object blur in Crysis).
At least it runs at a solid 60 fps. The higher resolution and cleaner image quality reveal the tricks employed by the designers, though (lots of flat 2D backgrounds mixed with the 3D). Those things blended together nicely in the 1024x576 console version, but not so well when you bump up the resolution on the PC. :\