Here's my tier list of how each community feels about their character:
Black Adam: Heavily Downplayed ("Hey man, he has bad matchups"!)
Aquaman: Aggresively Downplayed ("It's so hard!")
Atrocitus: Moderately Downplayed
Superman: Downplayed beyond all belief ("He loses to like 85 characters!")
Batman: His community would like to downplay, but the rest of the community isn't gonna let them finish their speech
Catwoman: Quietly hoping to stay under the radar. May need to downplay eventually if cover is blown
Deadshot: Downplayed for Survival
Poison Ivy: Her community (Dragon) is cautiously optimistic, is proud of the fact that they can win despite believing she loses a lot of matchups, but doesn't know anything about movies
Darkseid: Cautiously optimistic. Sonic says he's broke, which translated into non-furry English means that he's probably upper mid tier.
Firestorm: His community is optimistic but doesn't want to admit it because they're slightly embarrassed by his fire hair
Green Lantern: Gross says he's broke. Fred Marvel says he sucks. It's a new game, but Lantern's community has used Supergirl's hyperbolic time capsule to stay exactly the same.
Dr. Fate: His community is confused and is both upplaying and downplaying at the same time. Also the Best Doctor Fate the World Has Ever Known doesn't play in tournaments. So like Nightwing, we may never know
Harley Quinn: Probably flying under the radar (People who struggle in tournament will likely skapegoat her to cover their skidmarks in pools, though).
Robin: His community doesn't care what you think, but also doesn't know what they think, and some of them will make Top 8
Green Arrow: Moderately optimistic. Which is expected after this community made it through The Struggle of poverty in Injustice 1.
Bane: Does Bane have a community? Doombawkz was hit by the recession and only shows up to mumble about blockable setups now
Flash: Zyphox and HBee started downplaying him somewhere in the middle of MKX, before his Injustice 2 gameplay was ever known
Black Canary: Her community admits honestly that she's a good character who isn't top, but isn't that bad. We should probably see if they're feeling ok..
Cyborg: 50% will say he's good, 50% will say he sucks, but no one will go to a tournament with him
Cheetah: No one will talk about MUs she might win, only ones she gets zoned out in
Braniac: Everyone will say he's secretly better than we think, but no one will play him
Supergirl: Holding out a small twig of hope, and falling asleep holding a picture of Takeda every night
Captain Cold: Community is holding a prayer vigil and trying fashion cobble bits of midscreen tech into a life-saving IV machine
Wonder Woman: Suicide Watch
Blue Beetle: Does anyone still play Blue Beetle? Has a BB been spotted in the wild? I am watching the Discovery Chanel intently.
Joker: Suicide Watch
Gorilla Grodd: His community doesn't speak English and just wants a banana. If you see him in your tournament pool, just give him a banana.
Swamp Thing: Already dead -- wasn't given a chance to live. Was buried on a Tuesday (Tuesday the 11th of May to be exact)
And for DLC youngins:
Red Hood: Is Red Hood a real character? NRS may take him back any day now "He may have been an accident, but we'll fix it soon"
Sub-Zero: He's the worst he's ever been because Tom plays him. Needs fixes
