I find Ganondorf to be an awesome combatant with loads of potential. He is definitely an advanced players character, and no less. Because of this, his game won't progress as fast as the rest of the cast, but he still rocks.
His Up Smash happens to be quite fast for being one of Ganon's moves, and has IASA Frames to boot, which can be canceled into a Jab, FTilt, or another Up Smash. I also believe one can combo a Dair with this move, but I may be recalling incorrectly. His Forward Smash isn't all that useful, but can be good on a pivot. It can also be directed downward at enemies returning to the stage, in case you're looking to KO rather than pop them up via Dtilt. His DSmash has wide range, and hits twice like it did it Melee. I would recommend using this sparingly though, as too much use will likely result in Ganon being punished.
His Jab isn't as fast as it once was, but it definitely makes up for that in reach, and the change in speed is minimal. It is still one of Ganons best moves, and can combo out of an Up Smash, Dair, and Forward B. His FTilt, aka "Sparta Kick" has a huge hit box, and is awesome for side KOs, and also combos out of Forward B. His DTilt is good for popping opponents up, and a decent edge guard option. It comes out fairly quick too, and has good range in front. Also, like the other previously mentioned attacks, it combos out of the Forward B. As for the UTilt, don't use it.
His Aerials are all fairly good in there own right, save for maybe the Nair. His Bair has quite a bit of range behind Ganon packed with good knock back, but unfortunately is not an amazing approach through RARing because of how tall Ganon is. His Fair has horendous lag, but comes out fairly fast and can be lag canceled if it is done through a rising double jump. His Uair is very good, as it comes out quick, and hits in front, up top, and behind him. It is really good for edge guarding and stage spiking if you hit with the toe on the back end of it when it's reversed. It is also one of his most reliable means of protection when getting back on the stage through ledge hop attacks. His Dair, through auto canceling, has to be one of his best attacks next to his Forward B. It has zero lag if executed properly, does massive damage, and spikes like mad. As for his Nair, it has it's situational uses, but it's hitbox is deceivingly low, and does not have great knock back or combo potential. Maybe I'm missing something here.
His Specials, while not all are great, offer him the support he needs for his laggy play style. His Forward B is the best thing he has going for him. It by passes shields of any sort, and can lead to suicides, combos from the jab/FTilt/DTilt, KO's through JC Up Smash out of a shield, or amazing tech chases. His Down B is very strong and can have it's lag canceled if used while kicking off the stage. It can also be used for approaches back onto the stage when you are high above. Using this out of a Forward B is a nice alternative to a tech chase, and is will kills at decent percents this way. His Neutral B has very small uses due to how slow it is, but it is the prime move to use after a shield is broken. It is also worth mentioning that if you use a B Turnaround with the Warlock Punch and then use it's reverse animation it covers quite a bit of distance in the air. Aside from that, it's uses are limited to catching someone off guard after a laggy move or recovery. His Up B is very good to use out of a shield, and has a disturbing grab range to it. Edge popping with this technique is also a good method to deter opponents from trying to edge guard you, and is a great surprise tactic.
I do not have much experience with his throws, so I am going to refrain from elaborating on them.
Ganon is just too awesome for words. He runs like he ate ex lax chocolates and he pulls out a sword he never uses, but we love him anyway. In the hands of an experienced player, he is amazing, and will surprise a lot of people. I also highly recommend for you Ganon players to check this thread out if you haven't already:
The Murder Choke Breakdown