For whoever wins, or anyone who has the game. Use the stalker complete mods.
http://www.moddb.com/mods/stalker-complete-2009
They give much better graphics and textures and improved AI and such. Doesn't change gameplay, so I recommend even using it on your first time playing.
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My
Heat
Natural Selection 2 (NS2) - FPS/RTS with depth.
Link.
Studios and publishers seem to have forgotten that games are supposed to be games, not CG films with playable action scenes.
Link.