Aerial wizkick has never has been unless you're playing certain characters.
Ganondorf has always done extensive shield damage with aerial Wizard's Foot, they added just a tiny bit more shield damage so that he could shield-stab on more of the cast, not just tall folk like Link and Captain Falcon.
The Mario held the shield a little too long for it to be a realistic representation of a "real" scenario, but if you shield something like F-tilt then try to shield a Wizkick, it's gonna get broken. And if you're near the ledge...well then kiss your stock goodbye, everyone Toon Link's weight and below can get OHKO'd when near/at the edge.
So, lesson of the day...don't hold shield against Ganon, he has ways around it. Or maybe through it. Dark Desire knows this very well. : )
EDIT: I think Samus is unchanged, but Mii Gunner got buffs