Some games are content to let you blow up buildings, or incinerate a jeep with a rocket launcher. That's cool; explosions are generally the go-to for demolishing a destructible environment. But fire, the destroyer of all things, never really lives up to its potential in games. Usually, it just sits in a single place, contained within invisible walls. Maybe it'll hurt you if you're dumb enough to stand in it. But that isn't the case with Far Cry 2.
See, in real life, if you take a flamethrower to a patch of dry grass, you can bet your ass said field will erupt in flames. Far Cry 2 makes--nay, lets--fire act as it should. Throw a molotov into a field watch as the flames spread realistically, opening up many tactical options for evading enemies and even burning them alive. It may be a different kind of destruction, but holy hell is it awesome.