Had another go earlier, definitely enjoying it. Shame I can't run it at particularly high settings, but for what I can manage it looks decent enough and runs smoothly, so I'm happy enough with that.
The machine gun is suprisingly powerful. It looks a bit weedy, but you can easily wipe out an unsuspecting enemy with one, almost as quickly as you can with any other gun.
May be a stupidly obvious question, but what's the difference between the mortar and the rocket launcher? I thought the mortar might arc the rockets slightly, but they seem to just fly in a straight line, and I can't see any other real difference.