Oh, yeah! I forgot to list all my other systems. Let's see, I currently have them scattered all around me, so I'll just inspect them all.
GameCube: Some streaks on the black circle part, but no other major flaws. Still plays games like the day I bought it.
Game Boy Advance SP: The first three symbols of the serial number have been ripped off due to me taking off the tape. Only slight scratches and the "L" button sometimes doesn't cooperate.
Nintendo 64: I sometimes have to blow on cartriges to get them to work, but good all-around.
Nintendo DS: Small, white blotches have appeared near the creases. Tochscreen still works. The serial number is greatly faded. I don't have the original stylus so I bought a replacement pack. It doesn't get too dirty, since I've kept it in an Intec metal case ever since I got it.
Super NES: The color is a rusty tan, which is the color it was when I bought it. Looks like it has a small mark from a black crayon near the cartridge port.
Game Boy Color(s): They both have scratches on the screen and both have soft "select" and "start" buttons. One of them is missing serial information, but they both work. I'm still trying to test whether the "COMM." link works between them.
Virtual Boy: There is dust in the tight spots. The stand has a crack in it. The fabric had to be glued back on to the visor on two separate occaisions. It was once dropped, but it still works.
NES: It's wierd, because this is the best-looking of all my systems. I sometimes have to "convince" it to play games, though.
Game Boy: In good condition, but looks like there's dust under the screen.
Game Boy Advance: The "L" button is soft, but it works. I use it to take pictures.
Game Boy Pocket: No detectable internal or external flaws.
Game Boy Micro: No matter how careful I am, dust always manages to get on the screen before I put on the faceplate.
Wii: Has some smudges, streaks, and fingerprints on it from me touching it too much.
All my systems are fully functional, even though I got them all used (except the Wii). They don't get very dirty, since when they're not in use, I keep them in individual tupperware containers, and I keep all the wires, games and peripherals in individual Shoprite bags.