My opinion:
Peach's Castle: Counterpick. Not neutral enough to be a neutral, but no reason to ban (other than bumper can save someone from a rest kill with a free kill on puff...
![Stick Out Tongue :p :p](/styles/default/xenforo/smilies/tongue.gif)
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Kongo Jungle: Counterpick. I see why some want this as neutral, but I think it should stay a counterpick.
Hyrule: Neutral. Probably everyone's favourite stage, and most used stage. There are effectively three parts to the stage, and you don't have to go to one part if you don't want to (I don't go to the right side aka **** tent. I force my opponents to leave, either by shooting a projectile at them or by telling them I'm not going there. Yes, I have typed in the middle of a match that I was not going to go there.)
Zebes: Counterpick. Everyone hates this stage because the lava kills you. I love it because the lava saves you. If you got hit by the lava, you were likely going to die anyways. When the lava rises, you can easily go to the top so that you don't get hit. Defenitely not neutral, but no reason to ban it.
Mushroom Kingdom: Ban. Walk-off edges. If you projectile spam on an edge, you force opponents to go to you, where you can back-throw them for a 0% kill. Too bad... like this stage.
Yoshi's Story: Ban. Cloud camping.
Dreamland: Neutral. Probably the most neutral stage there is. The wind does not hurt recovery, only pushes those already on the stage. Proof: face an edge when the wind is blowing and mash the taunt button. you will taunt cancel on every ledge except the far right one (wind doesn't reach). No reason not to have as neutral.
Sector Z (MY OPINION): Counterpick. I honestly don't see why this is banned. You can avoid projectile spam by going behind the fin. The wall on the right side is not as bad as the **** tent in Hyrule. The ships that come are predictable. If you play this stage 5 times, you'll know where each ship goes, what it will do, when it will shoot, etc. There's even a warning sound telling you that a ship is coming (sounds like the wind?). When it shoots from the back, you can dodge the shots by moving anywhere. If you stay still, you get shot. If you move a little, you don't get shot (best if you jump). I think I covered all the reasons people want this stage banned...
Pokemon Stadium: Counterpick. No reason to ban. Ness players who don't like this stage can use their alts, or if they don't have an alt, then their fault. Banning a stage because it might be bad for one character... If that's the case, why not make melee Yoshi's Story a counterpick, since Marth has soo many advantages on that stage? I see more reason to make Yoshi's story a counterpick than Pokemon Stadium banned. Don't worry, I think Yoshi's Story should stay neutral. Just using it as an example.
*gameshark stages*
How to play: Neutral / counterpick. If I remember right, the bottom is like Congo Jungle where you can pass through the bottom onto the stage. It's flat with one platform. Pretty neutral in my opinion. I don't remember if how wide the side boundaries are... If I remember right, they barely exist. If that's the case, this stage should be counterpick. Otherwise, neutral.
Kirby beta stage 1 (aka SMALL): neutral. It's a smaller Dreamland, with a Congo Jungle bottom.
Kirby beta stage 2 (aka NEW): Ban. Melee Hyrule effect, too many obstacles, etc.
Metal Mario: Counterpick. Too small to be neutral (there's not much on this stage). Yet, there isn't any reason to ban it.
Battlefield / Polygon stage: neutral. Basically Dreamland.
Final Destination (If it ever gets fixed for multiplayer use): Neutral. No explanation necessary.
Race To The Finish: Neutral. Come on, who doesn't want to have an epic fight on this stage? KOing someone is hard (they basically have to let themselves be killed). And yes, KOs are possible on this stage.
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So... the only stage I would change it's state would be Sector Z. Please read my reasons. Maybe I missed something that makes it banned, or maybe I have a flawed reason. Or maybe people want it banned because the don't like the ships' lazers, just like people don't like the lava. If you play it enough times, it's just like hyrule. I'm only suggesting it as a counterpick... let me know your side of the story. I'm not a pro, but I'm not a banned-stage-in-tournaments noob.