It's pretty fair considering how easy it is to just camp him, though if he gets the bowser treatment I would not mind a nerf similar to bowsercide. But yeah, it is pretty dumb seeing someone plank in general if that's the part that annoys you.
Explain what you mean by "Bowser treatment".
But for the most part, I agree. Despite the fact he improved from Brawl, Ganondorf is
still garbage and low-tier. Worst part is that some of the patches actually made him worse in certain ways (DSmash now sometimes fails to set up for the second hit from the first, meaning he's punished for free on
hit).
Don't get me wrong, I love Ganondorf, and he's obviously my main, but he's so bad that he
needs that threat to keep him from being relentlessly gimped. It's one of those things that threatens to instantly even the match back up on a first stock, or to steal victory from the jaws of defeat. And yes, I
will Ganoncide you without even the barest shred of remorse. If you're trying to gimp my recovery, I'm going to make you pay for screwing up with your stock.
And the hell of it is, it's a slow move, plus leaves him helpless if he misses. It's the epitome of an all-in, and if you're consistently getting grabbed by it, you are at fault for being predictable enough to make it a valid option.
If you want to take that tool from him, you have to
immensely improve his recovery game so that he doesn't die for free off-stage. Think Melee recovery options on steroids good. Well, that or buff both recovery and his defense up (in smaller amounts, obviously) so he's not off the stage as often, and can get back more reliably when he does.
TL;DR: Ganoncide is legit as-is, and changing it would make him the undisputed bottom-tier character.