My PC is a good deal above the system requirements, yet the FPS on the campaign map are beyond terrible. The campaign map runs in my case @ around 15FPS, and that is a far cry from what is required to offer the eye the illusion of fluid movement.
win 7 64bit
i5 2500k @ 4,2GHz
catalyst 12.3 (newest official driver)
8GB DDR 3 Ram