I like Dr Wily's level too, but I hate having the Yellow Devil interfere in matches.
Also, in future releases, I would like to see more Sonic zones represented. And characters, lol. Maybe if Sonic Boom does well. But particularly, Chemical Plant Zone would be awesome. The spinning floor tiles would make it really interesting to fight in. Other possible locations and characters I want from Sonic series:
-Knuckles: The obvious choice if they add more Sonic characters. He's already a fighter!
-Espio: While a less important character, having another ninja in Smash would be cool, especially since he has very different abilities from other game ninjas.
-Rouge: Need a female character, and Rouge would be much more viable in Smash than Amy, since we already have a character that can pull a hammer from nowhere.