I don't know if I'll be able to make the biweekly this week. If I can, I'll post within the next couple of days.
I like Pictochat as CP, if you look at the hazards of the stage none of them will kill you, in fact, more often than not they save you from being KO'd (Side spikes come to mind) Even the missiles do negligible damage and set knockback, and spawn at fixed points. The only stage parts that I find extremely detrimental to combat are the whale and the blocks (for stalling purposes,) the wind, the mine cart, and the ladders. All of them easily avoided, but gimp everyone equally (Except the wind. That ruins characters with vertical based recovery aka Link) I don't see a strategy in picking this level, and doubt it would actually be counter picked, but I think the option should be available.
Pirate Ship, well, my only issue with it is the temporary low grav and when the ship beaches itself on the shore. More specifically, when the ship unbeaches itself I've seen players get stuck in the rocks and absolutely unable to avoid the hull of the ship spiking them. It happens a surprising amount in our friendlies, but stage control could remedy that (it never happens to me, so I assume it's avoidable with proper positioning. I just thought I'd bring it up) The cannonballs are easy to see coming and the flipper is easily avoided. And water gives certain characters advantages, but not overwhelming ones. I don't see water as a reason for a ban :s Besides, Delfino / Japes have water.
Onett I can deal with, but D3 = win. Until a car comes, anyway. Then he either kills you or regrabs 'till the next car breaks you out. Repeat. Softban D3 on Onett?
Corneria, I hate that level. Killzones are ridiculously short and it has a permanent wall. Plus, the offstage / edgeguarding game in this level is almost nonexistent due to the short side killzones.