I've used PS3, 360, 360 MLG, CCP, Mad Catz Fight Pad (don't play this game on DPad), and although none of these controllers are as good as the Gamecube one for Smash, you can still get by just fine. You just have to map the buttons properly (Brawl lets you do this or you can do it for Melee in Dolphin)
on a CCP it'd be like this
A + X = Jump
Y = Special
B = Smash
So you can still use the GC layout on inferior Smash controllers! And I'll be trying to find a way to use a different controller or the Gamecube one on the Wii U, I know by the time Smash Bros. comes out someone will do it. Playing with the Game Pad/UProController just not going to do with that stick layout.
on a CCP it'd be like this
A + X = Jump
Y = Special
B = Smash
So you can still use the GC layout on inferior Smash controllers! And I'll be trying to find a way to use a different controller or the Gamecube one on the Wii U, I know by the time Smash Bros. comes out someone will do it. Playing with the Game Pad/UProController just not going to do with that stick layout.