All this bickering, I thought we might as well do a stage synopsis. Just simple scoring based on whether a character performs better or worse on a stage on average. A total of all the 7 most common characters (Fox, Falco, Marth Sheik, Peach, Puff, Falcon) should give a score that shows how balanced a stage is, in general. My opinions obviously won't match everyone's but I think most of mine will match the consensus with only small deviations. Remember, THE LOWER THE SCORE, THE MORE BALANCED IT IS.
Final Destination:
Fox: slight disadvantage (+.5)
Falco: slight advantage (+.5)
Marth: heavy advantage (+1)
Sheik: neutral
Peach: neutral
Puff: neutral
Falcon: heavy advantage (+1)
score: +3
thoughts: obviously a neutral. +3 is a very good score.
Battlefield:
Fox: slight disadvantage (+.5)
Falco: neutral
Marth: slight advantage (+.5)
Sheik: neutral
Peach: neutral
Puff: neutral
Falcon: neutral
score: +1 (maaaaybe, giving Fox and Marth scores is questionable. so balanced lol)
thoughts: the most balanced stage in the game. Needs to stay a neutral.
Yoshi's Story:
Fox: slight advantage (+.5)
Falco: slight advantage (+.5)
Marth: slight advantage (+.5)
Sheik: neutral
Peach: slight disadvantage (+.5)
Puff: heavy disadvantage (+1)
Falcon: neutral
score: +3
thoughts: once again, relatively balanced. I don't think there is an argument for this stage to be anything but neutral.
Fountain of Dreams:
Fox: slight disadvantage (+.5)
Falco: neutral
Marth: slight advantage (+.5)
Sheik: slight advantage (+.5)
Peach: heavy advantage (+1)
Puff: neutral
Falcon: heavy disadvantage (+1)
score: +3.5
thoughts: FoD is a borderline neutral, arguable CP. Stagestriking and all that make its position on a stagelist hard to determine. Though it should be said that it can be easily argued that Marth and Sheik are actually heavy advantages rather than slight, thus making the score seem a lot less appealing (esp. compared to its rival, Stadium).
Dreamland:
Fox: slight advantage (+.5)
Falco: neutral
Marth: slight disadvantage (+.5)
Sheik: slight advantage (+.5)
Peach: heavy advantage (+1)
Puff: heavy advantage (+1)
Falcon: neutral
score: +3.5
thoughts: once again, obviously a neutral.
Pokemon Stadium:
Fox: heavy advantage (+1)
Falco: heavy advantage (+1)
Marth: neutral
Sheik: slight disadvantage (+.5)
Peach: slight disadvantage (+.5)
Puff: slight disadvantage (+.5)
Falcon: slight advantage (+.5)
score: +4
thoughts: Stage striking is a *****. The argument to whether this is a neutral or not over FoD can go back and forth; the fact of the matter is that they are similarly balanced. Fastfallers **** on Stadium, floaties **** on FoD.
Brinstar:
Fox: slight disadvantage (+.5)
Falco: heavy disadvantage (+1)
Marth: enormous disadvantage (+2)
Sheik: slight advantage (+.5)
Peach: heavy advantage (+1)
Puff: enormous advantage (+2)
Falcon: slight advantage (+.5)
score: +7.5 (!!!)
thoughts: jesus christ. the score doesn't even include the lower tier (but still very relevant) characters like ICs which get absolutely demolished by this stage. non-Puff edgeguarding is removed, lava removes all previous spacing, and horizontal movement (dashdancing, wavedashing) is stymied. Easily the most imbalanced stage in the current ruleset. In fact, I'd argue that Brinstar is more imbalanced than multiple stages not currently on the stage list. Its a miserable stage.
Rainbow Cruise:
Fox: heavy advantage (+1)
Falco: neutral
Marth: slight disadvantage (+.5)
Sheik: neutral
Peach: slight disadvantage (+.5)
Puff: slight disadvantage (+.5)
Falcon: slight advantage (+.5)
score: +3
thoughts: as gay of a stage it is, Cruise is actually pretty balanced. I don't think Cruise does any harm being on a CP list; its so balanced that people rarely pick it anyway. Sure Falcons or Foxes can pick it, but most are so uncomfortable on it (and/or worried about getting gimped) that they just pick Stadium or something. Its a balanced stage that won't ever see much play because of how weird it is.
Kongo Jungle:
Fox: slight advantage (+.5)
Falco: neutral
Marth: slight disadvantage (+.5)
Sheik: heavy advantage (+1)
Peach: slight advantage (+.5)
Puff: neutral
Falcon: heavy advantage (+1)
score: +3.5
thoughts: Kongo is at the very least a CP, arguably a neutral. Its distribution is identical to Dreamland, and I'd argue its balance is very similar. Understandable that it is a CP most commonly though, the barrel is stupid, and the ledges/high platforms reduce edgeguarding/gimps. So though its as balanced as Dreamland, its much gayer/more random. Probably should remain a CP for that reason alone.
Mute City:
Fox: slight disadvantage (+.5)
Falco: slight disadvantage (+.5)
Marth: slight disadvantage (+.5)
Sheik: slight advantage (+.5)
Peach: heavy (enormous?) advantage (+1)
Puff: heavy (enormous?) advantage (+1)
Falcon: neutral
score: +4
thoughts: booorderline ban. very easily could be argued as a CP. Based on its score and point distribution, there is essentially no argument that Brinstar should be a CP over it. Though that probably says more about Brinstar than Mute City.
Corneria:
Fox: enormous advantage (+2)
Falco: slight advantage (+.5)
Marth: neutral
Sheik: neutral
Peach: slight disadvantage (+.5)
Puff: slight disadvantage (+.5)
Falcon: neutral
score: +3.5
thoughts: ****ing Fox. If he didn't exist this stage would be considerable. Though the score isn't too bad, the distribution is what is worrisome. Fox could very well be a +3 but I just didn't want scores to go that high. The stage is really campy and the fin can be really stupid. I suppose this is another borderline ban, possible CP, just like Mute City.
conclusion: all this exercise really showed is how ******** Brinstar is. Corneria and Mute City can be argued either way, and convincingly, so I don't really know, but they are both much, much more balanced than Brinstar. Also, if you are curious:
OVERALL character balance (sum of all scores for stages); current neutrals (FD, BF, DL, YS, FoD), CPs (PS, Brinstar, KJ64), new CPs (MC, Corneria)
Fox: -.5, +1.5, +1.5
Falco: +1, -1, 0
Marth: +2, -3.5, -.5
Sheik: +1, +2.5, +.5
Peach: +1.5, +1.5, +.5
Puff: 0, +1.5, +.5
Falcon: 0, +3, 0
Basically reinforces some facts we all knew were true. Marth destroys on neutrals but sucks on CPs, Sheik is pretty good on just about every stage, Puff's major strength is her counterpicks (heavy advantages on some stages), etc.