I'm quite liking the stage freeze code. But I don't like what it does to delfino/halberd. Halberd becomes a walkoff stage (and I think the game applies weird gravity here, as well; note I'm not using any grav codes), and delfino... just isn't delfino anymore. I'll group castle siege here, too, since although I do think it could be neutral in its frozen state (just like delfino), it was already CP, meaning it doesn't really need fixing. These stages are unique, and they should be kept that way.
Anyway, as I expected, rumble falls is still awful (it's also another culprit of weird gravity), as is 75m.
Pirate ship becomes... interesting. The lack of hazards is great, but it's just... weird, with nothing moving at all. You still move in the water, and the front of the boat still spikes, but it just feels... off.
Norfair is amazing. I always loved the ledge tricks on this stage, and techchasing is a little bit too good, but it was awesome not getting interrupted by all the lava and stuff. An excellent stage.
Of course yoshi's island and lylat become awesome with this. Although I think my wii was making weird sounds when I was on yoshi's... Naturally these stages look a little weird at first with it not changing and all.
Frigate orpheon is another one I think needs to be left alone. It was CP before, so let it stay that way.
Luigi's mansion sucks with this code. You can't break it anymore, and it's worse than the cave of life on temple.
Spear Pillar would be amazing if it weren't for the cave of life below it. A shame.
Port town aero drive is ugly. This is talking both from a gameplay and visually appealing perspective. The collision bubbles for the ground are a lot further up than they seem, and having the "START!" stuff behind you at all times is very weird. Other than that, it's ok, and could be made into a counterpick.
Warioware is great. Just whatever you do... DON'T get stuck on the platforms. You. Will. Get. Wrecked.
If it weren't for the left side of distant planet being a great camping spot and the fact that it's possible to create an infinite run loop with sideB recoveries (ie. fox's), I would say it was great, but it's just the source of too much gayness. I forgot how all the other effects on this stage are really just a distraction and not really the reason for the stage's ban.
Flat stages that may actually be worth looking at for an unban now with DDD's loss of his CT: Flat zone 2, bridge of eldin, mario circuit. Mario circuit doesn't even need the stage freeze code to be made playable - this thing was borderline to begin with.
Everyone knows that PS2 is amazing with this code, and that the loss of PS1 kinda sucks.
Rainbow Cruise is banworthy with this code. You can reach the platform you normally drop from at all times, and the platform above it (although you take damage while on the latter). Fox can get up there in two ways: 1) Shine land on the top platform of the boat (faster than landing from the end of a double jump, although requires precise timing), and then double jump up to the first sky platform, or 2) Double jump and firefox up there. When his opponent chases him he can jump off and laser on the way down, and then run for the top platform again when they try dropping. Long story short, run loops aren't good.
Big blue has some serious temple syndrome, which is sad. F-zero needs some love.
Yoshi's island (melee) becomes weird. Once you hit a block, it just stays down. The entire match. Still banworthy, but entertaining to play on with the hole in the middle for the whole match.
Green greens always having exploding blocks on the left really isn't a problem as far as I'm concerned. Once the blocks are gone, they're gone for good, and you know it's there. It's like ZSS's suit parts. You can take advantage of it at the very beginning of the fight, and it can be dangerous if you're not weary of it, but it ultimately isn't that bad.
Oh, and protip: don't try picking mushroomy kingdom 1... it freezes.