After finally trying it, I'm very impressed. The weapons and vehicle control is very percise yet difficult to learn, taking all luck out of the game. You can react with ANYTHING in the game that you would consider playing with. You can't exactly pull grass yet but its not far away.
The Radeon HD4850 can run the game at 1920x1200 with all settings on Medium and hold steady at 55% GPU usage. My system can't capture video very well without the processor jumping from 60% to 100% and causing mad lag but I took a few xfire vids and screenshots.
I've done the basics, which include using a machine gun to clear a small jungle forest, as you can see above. It's neat to find a game which has true cause and effect. You can literally make a tree fall a specific direction and fall killing a horde of men.
Other screenshots, including my Hummer with spinnaz, are in my xfire profile.