Far Cry 2. As much as the story mode sucked, with the map editor mode it basically gives me an inifinity of trees and foliage and sticks my character with a flamethrower and infinite molotovs and says "Burn shit now!". Also an infinity of bullets and a bunch of different explosives, including ammo boxes and propane tanks, fat and thin varieties. Also vehicles that are explosive but also I can make a bunch of hills and make a one player race practice course or a tall ass cliff with hang gliders on it and dive off with the gliders. With all of that, I can't really call it bad if it lets me do all of that.