Is the upper (lighter colored) half of your NES console cracked or broken or missing a game door, covered in stickers you can't remove, or yellowed horribly from prolonged exposure to light? Replace it with the original! Includes complete unbroken and working game door.
Excellent -- no chips, no yellowing, no major scratches or cracks.
Good -- may have a very tiny chip or two missing from a lower corner where the upper and lower case halves meet, slight yellowing, minor scratch or other very minor cosmetic blemish -- which you'll probably never notice.
Poor -- usable, but may have a large deep scratch on top, a small hole or crack in the heat vent grill, extreme yellowing, or some other cosmetic blemish