Side b only once in the air is a good thing. I self-destructed myself many times from doing it in the air then trying to do up b immediately to recover, only to continue the combo to my death.
How can R.O.B. have a sequel? He's more of an accessory than a video game character. The only game that he was in that I can remember was Mario Kart DS.
Also, the Sm4sh tier list is suprisingly leneint.