I actually don't think I've come across this in any other FPS, but holy shit the amount of times I'm lurking and one of my teammates cuts me off from a different spot, but within the same side of the map, clomping around like they're playin...

I think a cool concept that should be added is you being able to choose a skin for the gun that you choose in the buy phase. So you don't have to choose before the game starts.