Today is Just Cause 2 demo day ... this is a good thing! While the draw of ridiculous, genuinely over-the-top action is a serious one, prior to playing it I was more than a little worried about how everything would turn out mechanics-wise.
A couple of tidbits worth mentioning about the demo:
Basically, you need to play this thing. Get it here on Steam, click this to queue up the Xbox 360 demo, or run (walking is overrated) to your PlayStation 3 and start the download using your hands like the rest of the world.