Well, this skin doesn't look bad, but i think the original fits the NES better. IMO the Title would be good for.....well, some sort of multi Nintendo machines emus (MNME), but that won't happen. It would look better, if it "evolved" the Original SMB Mario to the SMB3 Mario.
Game select screen: The only thing that's NESish is the Mario in front, as you can clearly tell its from SMB3 (the only game that had the beaver or whatever thingy), but I would prefer it, if it had real NES graphics.
and Generaly: the backround! The stars are just too generic. Something more NES specific would be nice.
The only thing that seems absolutelly perfect is the Config screen.
This is all meant to be constructive criticism, so you can improve the skin.
I know what you're saying, you have no idea how many backgrounds I went through for the main menu before deciding on this one. Here's another go around, with some of the suggestions put in place...
Any other images have remained the same (config screen).
Constructive criticism is awesome. Better, worse? Comments appreciated. Both versions of the skins are available for download, I didn't update the file, I made a new post for the classic version.