I'm going to break this up into just three parts and go from there. Variable differences / standard deviations aren't necessarily painting the best picture as the scope of overall game understanding is small. Overall gist of it from my opinion is big contrasts to our understanding is wifi dominance related.
High Tier
(+8) (±0) (-2) (-1)(+1) (-2) (0) (+4) (-3)(-1) (-1) (+16) (+14) (+2)
Okay, so everyone agrees
diddy is god, and that even with nerfs sheik is likely still in the inner-circle of best characters. I'm probably not too phased by
Sheik being top 3 at this current stage (this could easily change with other balance patches) with her current set, she can really struggle to get the kill and her overall amazing capabilities aren't too extreme in any way, unlike Diddy.
Falcon obviously seems out of place, but likely not by much, followed by Mario.
Mario is extremely potent on Wifi, one of the few characters I abhor coming up against due to spacing/reaction being toned down in place of Mario's relatively slippery frame data (The Roll Master), I think it's fair to put him in the middle regions with the current disparity of opinions.
I think ever since the patch
Greninja has been quite poor, but as Japan was the only region focusing on him I'm not sure if he's still even relevant there, but I feel he's on the downwards trend.
ROB is a monster on wifi and vinnie has results as well as a little bit of Chibo. A good looking Diddy match up means a lot, but I'm not sure its enough to confirm him in the upper caste.
Shulk is amazing and probably is in the high regions now, a large plethora of straight number buffs to everything should be noted by any budding designers/thinkers because this is why small number changes can have
HUGE IMPACTS
Sonic being on the lower ends is very surprising, but that will definitely change.
Middle Tier
(+2) (-3) (-3) (+2) (+6) (+11) (-2)(+2)(±0)(+8)(-13) (-8) (-5) (+2) (+14) (+3) (+9) (+18) (-8) (-1) (-1) (-8) (+1)
Dedede is the best heavy on wifi by far. Gordos are head to deal with, his disjointed range is hard to deal with, his poor frame data on moves is less impacting. I can see why he's there.
Pikachu is the sore thumb here, definitely looking like he shouldn't be anywhere near these other "bad" characters
I'm waiting for any indication that
Bowser Jr isn't horrendous off of wifi, his custom specials are very abusive though, but I doubt this is considered.
Peach dropping a lot makes sense due to her losing quite a few cheesy things/bug fixes occurring. Her current "tier" is fine for now although it would seem by most people's standards she's pretty good.
Mii Brawler is weird, are people considering him with customs or not? I don't know if he's in the upper mid without that, but eh, he seems pretty good otherwise.
Finally some differentiation seen between Marth/Lucina and Pit/Dark Pit.
Good.
Low Tier
(-18) (-3) (-3) (+10) (+6) (+2) (1) (-4)(±0)(-7)(-3)(-16)(-2)(±0)
Mac plummeting as people get over his gimmicky strengths and learn to abuse his arguably under compensated weaknesses. I don't know if it's fair to call him low tier yet, though.
Donkey Kong and
Charizard not getting much love as fatties yet have actual tournament results which I'm pretty sure
Dedede and
Bowser do not. But alas the fatties which are more react/frame trap based over just spamming very hard to deal with moves (i.e. like little mac) are garnering higher opinions from the general public.
All I can say about
Luigi is that I'm pretty sure he's better than
Mario and
Doc. BUT he could still be in those lower regions, I'm not entirely sure.
Meta Knight is rising and he'll likely continue to rise. His down air and up-air got noticeable range buffs (2 units is big), enough for me to be able to consistently space those moves now in safe-ish ways, that combined with getting some kill moves in nair and bair means he's significantly stronger than his pre-1.04 state. People's opinions right now may or may not reflect that properly.
Palutena and
Falco then look like the two odd characters towards the bottom of the list that we know people don't understand very well. I think it won't take long for people to consistently see why Falco isn't worthless, and in Palutena's case she's "good" without customs but a lot less abusive, although her down throw, dash attack and back air are top tier moves (definitely top tier moves) which needs more time to settle; although without customs she may forever be doomed to not getting much out of those amazing moves.