How Bad Are Smash Ultimate's Low Tiers?

Here's how much of a failure (or not a failure) are Super Smash Bros Ultimate's Low Tier Fighters... Are they even that bad? Plenty of people feel Ultimate's roster is Smash's most tight-knit roster viability wise, yet there's still plenty of low tiers.
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0:00 Ultimate's Low Tiers
1:21 Mewtwo
3:24 Robin
5:41 Donkey Kong
6:54 Isabelle
8:34 Bowser Jr.
9:49 Ike
11:09 Villager
12:00 Zelda
14:52 Simon/Ritcher
16:14 Kirby
17:21 Mii Swordfighter
18:48 Piranha Plant
20:25 Doctor Mario
22:00 King Dedede
22:33 King K. Rool
26:08 Little Mac
28:00 Ganondorf

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