When I was playing against my friend, we pit him against many movesets (SMBZ Marios, Goku over Pit, Shadow, Kid Buu just to name a few), and I found it pretty hard to compete in matches vs. my friend. We also pit him against some regular characters too. He felt a little awkward when I tried to play as him. It didn't really feel to natural, but it was workable. Sorry if this is useless feedback...