Ganon is definitely garbage on the ground, but he's surprisingly solid in the air. I've been messing around with him for a few months now and, he's honestly amazing. Not good at all, but amazing. He has a lot of tricks that work really well, but it's mainly just a matter of if your opponent is wise to them or not. He gets ***** by the top tier (minus Snake) regardless, but his mid-tier MUs aren't all that bad in practice if those tricks get thrown out at the right times.
I'm no Ganon main, but I'd MM anyone that says they can just shield Ganon's attacks. I'll enjoy all those B-Air fakeouts to Aerial Flame Chokes and Double D-Airs.
Ganon's buffers are pretty underestimated. (Then again, it IS Ganon after all.)