Why do people always think Marth's sword is shorter than previous games?
Anyway, Ganon's aerials are ok, they all fill their niche well. F-air is like an aerial F-smash, slow, powerful, beats other attacks, and it's used in similar situations. B-air is quick and powerful and is one of his few safe options in neutral. N-air is a good combo breaker and a workable approach. D-air is almost an insta kill offstage and is a good getup read at lower %'s.
And then there's U-air, which, IMO, is the single best aerial in the game from a property standpoint. Kills, Fast startup and endlag, a lenient autocancel window, a massive hitbox that arcs all the way around, huge damage, and multiple amazing angles that allow you to put your opponent wherever you want. Seriously, imagine almost any other character in the game with Ganon's U-air.
And for the record, Sheik leans into her F-air more than Marth. Doesn't really matter much when it's disjointed for some stupid reason
But she does.