Not to play Devil's Advocate here, but I can take a crack at what was being said.
Mainly, the idea would be just how vast that the movesets where among each other since you can say that each character did play vastly different from each other and shared little to no similarities. Examples here being that Link can set up Spinners so that they can collide with each other to do more damage (or having a giant fairy act as Link's tank while he is stuck in a bottle), Lana setting up blocks that can be triggered to explode (or her using the summoning circle to bring miniature boss characters to help her out), Ganondorf's darkness meter where if filled up, can clear out enemies around him, the projectile happy Wizzro, Ghirahim being able to augment his attacks on an enemy if he hits them with a knife, Zant going into a full Berserk mode with his moves to either unleash a twister attack (or if he goes for too long, he can leave himself vulnerable to attack), Young Link using the Fierce Diety Mask to destroy everyone against him and so forth.
So many different play styles with each character that you can't help love the amount of work that was put into each move set (even the one for Agitha). Apparently though some think that "Because that person uses a sword, they will swing the sword the exact same way." Something to which as a person who has played alot of Dynasty Warriors games, I would politely disagree. Especially if you look at DW type games nowadays where each character has their own special ways to take down enemies. Still, no denying that Hyrule Warriors did have a wide variety of character options and while some weren't as "Melee Heavy" as others, each character with each of their weapons definitely offered something special to the table.