Same to me, maybe is the ammount of Vram what cause this. i have 1GB too but in a GTS 450 :(

THem need to fix their Walls, because are ridiculously weird when them fall

Can easily avoid the Hiding effect by turning down the object render distance :P

I think that the Minimap (GPS) is alright on the center of the screen because you want to keep the head up while you looking at the map, that way if enemy spot you can easily see him than if the Minimap is in a corner or something.