I personally love this colour, but it is a very brown-toned, brickish red that might not appeal to some. I think brown-based reds are very under-rated; I have cool, blue undertones but I find brown-based reds are the most flattering on me. (I do have green/brown hazel eyes, that might be why.) I think Nars Moscow is an unusual red lipstick, due to the brown colour and matte finish, but if you don't mind those qualities it's a beautiful lipstick.
Nars Moscow Pure Matte Lipstick: Photos