I got this off Steam a few months ago, and after an initial few hours of wow factor, I found it actually to be a pretty dull, lifeless game. It's too big, and extremely repetitive, and the AI becomes difficult through bald cheating rather than any actual challenge. They can just see and shoot you through pretty much anything, even though they themselves are almost invisible in the brush and trees.
Gorgeous looking game, but really not much beyond that. Certainly not awe inspiring gameplay in any form, considering it's mostly just rote FPS shenanigans. The fire effects and how they're used are nice, but that's really about it that I can think of that's stuck with me. The rest, the respawning enemies, the pointless malaria, and the tiresome treks from one side of a largely blank expanse of grassland to another caused the game to lose its luster pretty quickly. Oh well, it was cheap.