While the terrain altering mechanics aren't ground-breaking (heh) by today's standards, it was quite impressive at the time. I first played this game on a Xbox 360 demo disk when I was but a wee lad. It blew my mind at the time. I replayed the demo (which I think was only the tutorial and maybe the first level) over and over. When I finally got the full game I had a blast manipulating terrain to provide cover, get into a higher position to snipe enemies, and launching enemies by raising the ground beneath their feet.