OK...
]Big Blue: "you're fighting the stage as much, if not more than your opponent", I disagree with that, as I think that you're only fighting the stage if you're both unfamiliar to the stage and not good at adapting. I almost never fight the stage, although I do make my opponent fight it a lot, that's by spiking. The only legit reason I can see is that you can't tech a Footstool-jump. As for low-damage kills banning stages, should we ban edge-hogging, edge-gaurding or spikes, Ike's F-smash? I don't think so, I also believe in trying to save a stage and not just going out and banning it. What's ban-worthy about Big Blue besides "distracting from gameplay" or "low-damage kills"? Neither of those are true ban-reasons in my oppinion.
There's a solid difference between low-damage kills because you can't recover once spiked (hell, you don't even really need to be spiked, a well-timed throw will suffice) and edge-hogging etc. Those things require greater skill to be preformed, and can be countered. Furthermore, they are not broken. If my opponent has 20%, and I use Pikachu to do a backthrow, making them bounce off the underside of an overhead car and die,
that's broken. Your "adapting" argument is also flawed because the stage changes with nearly no warning. It's equivalent almost to the "adapt to items" argument.
Rumble Falls: "you're fighting the stage as much, if not more than your opponent", again, I don't find that a reasonable ban-arguement, as a little stage familiarity fixes that, in Melee should we ban Pokefloats? What about Rainbow Cruise? In my oppinion fd is a lot more broken than any of these, yet it made Starter and both Big Blue and Rumble Falls made ban (although I'll just strike it and use it as my global ban instead of crying out for it's ban). Another thing, Rumble Falls is not Icicle Mountain, and even if it was, it wouldn't be that bad.
The problem with Rumble Falls is the random "SPEED UP!"s and things like the stupid spiked which KO at low percents. Stuff like that is an unfair advantage, and also it's more fast paced than PokeFloats. Not to mention PokeFloats doesn't have any major obstructions, but Rumble Falls has a constant nuinsance in its ceiling. Icicle Mountain was a similar problem, and as such was banned. And Final Destination is nowhere near Rumble Falls level. Despite leaning heavily towards projectile users, it is nowhere near broken.
Hanenbow: "circle", I would agree if you couldn't jump up through every last one of the platforms, even 75m might not be that much of a problem. I'd unban Hanenbow in both singles and teams, and I'd test 75m some more (probably still banned in singles, not teams).
I'm sorry, but the fact that you said that 75m might not be a problem almost makes me want to disregard your post. You obviously have no idea how problematic the circle is. Ever tried to play Ganondorf VS Falco on Hanenbow? Yeah, that's what I thought.