I played the Demo Yesterday.
(On a AMD Athlon XP 2400+ with 1796MB DDR-Ram @333Mhz, ATI RADEON X1650Pro (256MB))
At first on lowest settings and 800x600 resolution, with smooth Framerate but Graphic looking worser than FarCry.
Changed to Medium and 1024x768, running well, just a few decreases in Framerate when there where more than 3 Enemies and looking much better.
Tried it also on the High settings, but got only something about 10 Frames, looking really Cool, if you don't move and just watch the Environment, but far from playable.
So basically it felt like FarCry, but there was on thing that disappointed me:
This self-regenerating Health and Armoury.
Since Halo, there are many Shooter with this "Feature", and i don't like it.
In GE64 for example, you can survive the most level without taking damage, well, if your really skilled, but in nearly every other shooter, your massive loose of health will be compensated with many health-packs or this self-regenerating thing.
It's senseless.