Alright, here's my nitpicks.
Ryu: At least as good as Villager. This was talked about at length before
Dafuq why are Greninja and Ike B-? Especially Greninja. He didn't get nerfed that hard.
Shulk should definitely be higher than C+. I think most people here can agree with that
Marth and Lucina in low tier? That's really questionable, especially for Marth and his tipper smashes which kill at like 50%. Also has good options to wall out some of the cast. There's also Lucina who is very well balanced and can wall people out like Marth can, although she needs solid KO moves.
Ganondorf I've already talked about. I did decipher the other day that reddit basically thinks that he's pretty much unchanged from Brawl, so his current standing is...sort of understandable. Should be between B- and C+
Zelda and Mewtwo are not D tier. They may be delicate, but they hit very hard and are devastating in the hands of someone who knows how to play them (I'm looking at Mael's Mewtwo), using a bait and punish playstyle to land their most potent moves.
Link vs Toon Link? I think Link is better thanks to his obnoxious grab, but neither character is played very often at mid to high levels so idk.
I feel some anti-Mac bias comes into play here. At high levels of play Little Mac is a monster. However it's the rotten apples of For Glory which hold him back from being about B where he should be, since he manhandles Captain Falcon, Sonic, Villager, Fox and arguably Diddy.
Doc has skyrocketed in popularity recently so I expect him to be in the mid tiers soon with all the shit we've seen Doc players do.
The looping combos aren't the problem with Sheik - it's the needles. They make it way harder to get onto her when people already had enough trouble with her speed. Being Transcendent, they also give her the option to camp her opponents. Luigi's still pretty damn good, I've seen gnarly stuff with him. Down B is surprisingly easy to combo into and KOs rather early as well. As for DK, cargo up toss to up air. Disposes all of the top tiers save Mario and Falcon at 75% or less if DK gets platforms to work with. Especially on Town and City's low ceiling.