Seems we're doing the stage discussion in this thread, so I'll add some thoughts as well.
Battlefield is probably the most neutral and balanced stage in the game. I see no reason to ban it.
Smashville is somewhat janky, mostly due to the moving platform and occasionally (rarely) the balloon. It could be a counter-pick in a 3 stage setting, but I think it should be a starter still.
Town & City is kind of like Smashville's cousin. There's some jank involved with the platforms, although it can be predicted, and the balloon is similar to Smashville, though it's rarely an issue. The low ceiling along with the platforms makes this a great stage for some characters though. I think it should be a starter.
Final Destination is a stage I personally slightly dislike, mainly due to the lack of platforms. This makes it harder to land for many characters and it makes projectile camping stronger. Ideally this stage should be a counter-pick, and in a 3 stage setting we could maybe afford that. In a 5, 6, or 7 stage setting it should be a starter. Replacing it with an Omega would work too, although I'd prefer if the choice of Omega would be universal.
Lylat Cruise has some issues, yet I find it to be a more balanced stage overall than Final Destination. It might even be a better starter than Final Destination or Smashville, if only people were willing to spend more time to learn the stage. I think it should remain as a starter, or potentially a counter-pick.
Dreamland is very similar to Battlefield, so it cannot be a starter. In a 6 stage setting it should be a counter-pick stage. In a 5 stage setting it should be removed since it offers the least originality, and keeping it and removing Final Destination would make stage select somewhat unbalanced.
Duck Hunt is the worst legal stage in the game, no doubt. The ducks and dog are annoying but can be dealt with, the lack of a Z-axis is a bit weird, and the bush is a bit strange. The biggest issue, by far, is the tree, which allows for circle camping against some characters, and generally janky plays. This is the stage that should go in a 6 stage setting, and maybe it should. As a stage itself I think we're better off without it; it's not mainly a "learn to play" issue like Lylat Cruise is, but rather issues with the map itself. However, removing it would change the dynamic of stage select, so we should be very careful before we reach a decision.
So, personally I think having a 3 stage list would be problematic. First of, which 3 stages should we have? Battlefield is a given, and then either Smashville or Town & City should get a spot. What's the third stage? We have three options: Final Destination, Lylat Cruise, or a second Animal Crossing stage. Having a flawed stage such as Final Destination take up a 3rd of all stages does not seem very appealing to me. Lylat Cruise could work, although I doubt that'll happen any time soon. This leaves two Animal Crossing stages. This stage list seems acceptable to me, but it has some issues.
What about a 5 stage list? In other words, ban Duck Hunt and Dreamland. In this system we'd either run with 2 bans and no Dave's Stupid Rule, or no bans and Dave's Stupid Rule (potentially ending up playing every stage in a best of 5). This could work, although there are some implications.
A 6 stage list would be similar except we'd just ban Duck Hunt. We'd still have to run with 2 bans and no Dave's Stupid Rule or no bans and DSR though.