A good amount of the big smash 4 competitive's initial impressions give him a meh rating, but honestly they've never really played him to begin with.. I think he could be a potential sleeper, if the list of changes from smash wiki are true.. He should be at least mid tier.. but could go mid high. His nerfs include lower combo potential from down tilt, he's more vulnerable when dashing, and no collateral from back throw..
But his buffs, besides univeral jump squat from smash 4 include:
-aerials having less landing lag
-higher jump
-jab doing more damage
-tilt attacks doing more damage
-smash attacks doing more damage
-all aerials doing more damage
- new down aerial that can meteor
-all throws do more damage
-all specials do more damage. Megavitamins being larger, dr tornado 4-->7 hits
I'm assuming he still got the nerfed dash speed as smash 4.. But essentially he trades ground speed and recovery for more damage all around. Combo potential is unknown.. but slower mario with more powerful attacks, with frame data of moves are nearly identical. It's something he should have had in smash 4 to begin with...
I'm still really butt hurt they nerfed his ground speed for smash 4 though.