I think Metal Sonic is the story of a good bad guy with wasted potential. He's got all the powers of Sonic and is better at it; he's faster, stronger, more durable, and arguably more intelligent. (That's a stretch though). It'd be nice to have Metal Sonic become a regular character to show up and try to wreck Sonic's day again and again.
However, I still love the wallpaper of Metal Sonic. Nicely done indeed. XD