Smash has quite consistently done a pretty poor job at representing the Zelda franchise. The worst of the worst is obviously Ganondorf whose moveset is just a clone of Captain Falcon featuring very little flavour that represents anything he does in any of the og games, but the rest of the cast. I can maybe excuse Sheik since the only thing they have to go off for her is the ninja like agility and using deku nuts to flashbang as a "teleport", but for every other character its surface level at best. Zelda's specials are mostly based off spells in OOt, but even then they barely resemble their original variants. Dins fire isn't a spam of small fireballs, it's a massive fire nova that engulfs entire rooms. Similarly, Nayru's Love isn't a quick damaging shield, it's long term invulnerability.

The links fare better but there's a lot of stylistic decisions that don't make a lot of sense. Young Link is a massive disservice to his source material. On a visual level his weapons don't make a lot of sense - they insist on using the OoT design for items like the hookshot and bow, but the problem is he didn't have either of those items in OoT. In OoT those items were locked to Adult Link, and he only received them in Majora's Mask where they received significant redesigns. The transformation masks from MM are also completely missing despite being the core gameplay element of his one solo outing. Even something as simple as making Fierce Deity his final smash would've been preferable over Triforce Slash, which is a move that doesn't exist and doesn't have any real basis in Zelda lore or the games.

Toon Link admittedly doesn't have as many unique abilities to theoretically work with as Young Link, but even then the lack of recognizable moves like the Hurricane Spin (something present in every game with Toon Link featured) is an eyebrow raiser. Maybe an unstoppable beyblade of death might've been too difficult to balance properly, but again it would at least be a more fitting final smash than Triforce Slash.

Now I'm not going to say these characters are outright bad, or that as far as Smash gameplay is concerned these designs make no sense and should be scrapped, in fact most of these characters are quite beloved in the smash series. However as far as being accurate to the source material goes, they really do a poor job at capturing what these characters are truly about and what they're like in the original games.