I have never once heard bad things about ganon. Ever. Everyone who "said" this (aka shadic having a nightmare and imagining the whole thing) is absolutely mad.
Zelda's a complex character that would take time to find players and a playstyle for. I haven't heard many complaints about her in a while (to the contrary, I've begun seeing more respect for her), so I think she could pop off that list of yours. The marth matchup sucks for me though, lol.
Snake, I've heard complaints for since day 1 or so. It's hard to say, but it looks to be going that way for him. Had to be someone, right?
Link has some split votes, but again I haven't heard much complaining about him in a while. Maybe about his bombs not being combo starters, but either version has it's merits. Also, if that's the worst complaint, then good job on making him.
Game and watch from what I saw is another polarizing character (but I haven't seen a lot on him). Public opinion seems to be "still deliberating", maybe leaning towards the lower side. If so, not by much. Same review for Lucas, but wonderboy has more vocal support.
Sonic has gotten more pointed fingers than game and watch from what I can tell (I, being one of said finger pointers). I also haven't seen a sonic that plays with real efficiency (myself included). All the videos are like... half good/half wrong choices (JC saved a stream with a goodish sonic, but he lost quite a bit iirc) and his speed isn't exploited enough yet (except by me, lol).
There was also a decent discussion about marth being outclassed due to everyone underneath him getting enough of a boost to cut him out of high tier (i missed the news that he wasn't in top anymore), but I haven't heard much outside of that thread on smashmods.
So if I were to revise shadic's list based on public opinion, Lucas and gamewatch are potentially down there (lucas, being pretty new to smash with this style could have a better chance at escaping this fate with a more explored meta), Sonic is likely down there (I'm biased. get at me. My list, *****), and Snake is probably in low tier.
Still obviously conjecture, but so far I'd say this isn't a bad barometer.