Red Faction: Guerilla is free on Steam right now (and on sale for 70 pesos. I may get it if it's still on sale when my Steam Cards are all sold.)
It's like GTA in Mars, plus the game gives you a hammer and a bomb that you can use to make everything that is not the ground go ka-boom.
Started out getting 30-40 fps, single digits when I bring down the building, but adding -nod3d11 to the commandline boosted my fps way past 60, and the only things I lost were ambient occlusion and sun shafts. It really didn't look that much different even with the absence of those two effects.
